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-rw-r--r--changelog.d/3567.feature1
-rw-r--r--changelog.d/3612.misc1
-rw-r--r--changelog.d/3626.bugfix1
-rw-r--r--changelog.d/3628.misc1
-rw-r--r--contrib/grafana/README.md6
-rw-r--r--contrib/grafana/synapse.json4961
-rw-r--r--synapse/federation/federation_server.py4
-rw-r--r--synapse/federation/send_queue.py63
-rw-r--r--synapse/federation/transaction_queue.py32
-rw-r--r--synapse/federation/transport/server.py3
-rw-r--r--synapse/federation/units.py1
-rw-r--r--synapse/handlers/room.py24
-rw-r--r--synapse/handlers/search.py2
-rw-r--r--synapse/rest/client/v1/room.py9
-rw-r--r--synapse/secrets.py7
-rw-r--r--synapse/storage/__init__.py2
-rw-r--r--synapse/storage/appservice.py2
-rw-r--r--synapse/storage/event_federation.py2
-rw-r--r--synapse/storage/events.py6
-rw-r--r--synapse/storage/roommember.py2
-rw-r--r--synapse/storage/stream.py16
-rw-r--r--tests/handlers/test_typing.py1
22 files changed, 5033 insertions, 114 deletions
diff --git a/changelog.d/3567.feature b/changelog.d/3567.feature
new file mode 100644
index 0000000000..c74c1f57a9
--- /dev/null
+++ b/changelog.d/3567.feature
@@ -0,0 +1 @@
+make the /context API filter & lazy-load aware as per MSC1227
diff --git a/changelog.d/3612.misc b/changelog.d/3612.misc
new file mode 100644
index 0000000000..f90d2f2ff5
--- /dev/null
+++ b/changelog.d/3612.misc
@@ -0,0 +1 @@
+Make EventStore inherit from EventFederationStore
diff --git a/changelog.d/3626.bugfix b/changelog.d/3626.bugfix
new file mode 100644
index 0000000000..9a4b878986
--- /dev/null
+++ b/changelog.d/3626.bugfix
@@ -0,0 +1 @@
+Only import secrets when available (fix for py < 3.6)
diff --git a/changelog.d/3628.misc b/changelog.d/3628.misc
new file mode 100644
index 0000000000..1aebefbe18
--- /dev/null
+++ b/changelog.d/3628.misc
@@ -0,0 +1 @@
+Remove unused field "pdu_failures" from transactions.
diff --git a/contrib/grafana/README.md b/contrib/grafana/README.md
new file mode 100644
index 0000000000..6a6cc0bed4
--- /dev/null
+++ b/contrib/grafana/README.md
@@ -0,0 +1,6 @@
+# Using the Synapse Grafana dashboard
+
+0. Set up Prometheus and Grafana. Out of scope for this readme. Useful documentation about using Grafana with Prometheus: http://docs.grafana.org/features/datasources/prometheus/
+1. Have your Prometheus scrape your Synapse. https://github.com/matrix-org/synapse/blob/master/docs/metrics-howto.rst
+2. Import dashboard into Grafana. Download `synapse.json`. Import it to Grafana and select the correct Prometheus datasource. http://docs.grafana.org/reference/export_import/
+3. Set up additional recording rules
diff --git a/contrib/grafana/synapse.json b/contrib/grafana/synapse.json
new file mode 100644
index 0000000000..94a1de58f4
--- /dev/null
+++ b/contrib/grafana/synapse.json
@@ -0,0 +1,4961 @@
+{
+  "__inputs": [
+    {
+      "name": "DS_PROMETHEUS",
+      "label": "Prometheus",
+      "description": "",
+      "type": "datasource",
+      "pluginId": "prometheus",
+      "pluginName": "Prometheus"
+    }
+  ],
+  "__requires": [
+    {
+      "type": "grafana",
+      "id": "grafana",
+      "name": "Grafana",
+      "version": "5.2.0"
+    },
+    {
+      "type": "panel",
+      "id": "graph",
+      "name": "Graph",
+      "version": "5.0.0"
+    },
+    {
+      "type": "panel",
+      "id": "heatmap",
+      "name": "Heatmap",
+      "version": "5.0.0"
+    },
+    {
+      "type": "datasource",
+      "id": "prometheus",
+      "name": "Prometheus",
+      "version": "5.0.0"
+    }
+  ],
+  "annotations": {
+    "list": [
+      {
+        "builtIn": 1,
+        "datasource": "$datasource",
+        "enable": false,
+        "hide": true,
+        "iconColor": "rgba(0, 211, 255, 1)",
+        "limit": 100,
+        "name": "Annotations & Alerts",
+        "showIn": 0,
+        "type": "dashboard"
+      }
+    ]
+  },
+  "editable": true,
+  "gnetId": null,
+  "graphTooltip": 0,
+  "id": null,
+  "iteration": 1533026624326,
+  "links": [
+    {
+      "asDropdown": true,
+      "icon": "external link",
+      "keepTime": true,
+      "tags": [
+        "matrix"
+      ],
+      "title": "Dashboards",
+      "type": "dashboards"
+    }
+  ],
+  "panels": [
+    {
+      "collapsed": false,
+      "gridPos": {
+        "h": 1,
+        "w": 24,
+        "x": 0,
+        "y": 0
+      },
+      "id": 73,
+      "panels": [],
+      "title": "Overview",
+      "type": "row"
+    },
+    {
+      "aliasColors": {},
+      "bars": false,
+      "dashLength": 10,
+      "dashes": false,
+      "datasource": "${DS_PROMETHEUS}",
+      "fill": 1,
+      "gridPos": {
+        "h": 9,
+        "w": 12,
+        "x": 0,
+        "y": 1
+      },
+      "id": 75,
+      "legend": {
+        "avg": false,
+        "current": false,
+        "max": false,
+        "min": false,
+        "show": true,
+        "total": false,
+        "values": false
+      },
+      "lines": true,
+      "linewidth": 1,
+      "links": [],
+      "nullPointMode": "null",
+      "percentage": false,
+      "pointradius": 5,
+      "points": false,
+      "renderer": "flot",
+      "seriesOverrides": [],
+      "spaceLength": 10,
+      "stack": false,
+      "steppedLine": false,
+      "targets": [
+        {
+          "expr": "process_cpu_seconds:rate2m{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}",
+          "format": "time_series",
+          "intervalFactor": 1,
+          "legendFormat": "{{job}}-{{index}} ",
+          "refId": "A"
+        }
+      ],
+      "thresholds": [],
+      "timeFrom": null,
+      "timeShift": null,
+      "title": "CPU usage",
+      "tooltip": {
+        "shared": true,
+        "sort": 0,
+        "value_type": "individual"
+      },
+      "type": "graph",
+      "xaxis": {
+        "buckets": null,
+        "mode": "time",
+        "name": null,
+        "show": true,
+        "values": []
+      },
+      "yaxes": [
+        {
+          "decimals": null,
+          "format": "percentunit",
+          "label": null,
+          "logBase": 1,
+          "max": "1",
+          "min": "0",
+          "show": true
+        },
+        {
+          "format": "short",
+          "label": null,
+          "logBase": 1,
+          "max": null,
+          "min": null,
+          "show": true
+        }
+      ],
+      "yaxis": {
+        "align": false,
+        "alignLevel": null
+      }
+    },
+    {
+      "cards": {
+        "cardPadding": 0,
+        "cardRound": null
+      },
+      "color": {
+        "cardColor": "#b4ff00",
+        "colorScale": "sqrt",
+        "colorScheme": "interpolateSpectral",
+        "exponent": 0.5,
+        "mode": "spectrum"
+      },
+      "dataFormat": "tsbuckets",
+      "datasource": "${DS_PROMETHEUS}",
+      "gridPos": {
+        "h": 9,
+        "w": 12,
+        "x": 12,
+        "y": 1
+      },
+      "heatmap": {},
+      "highlightCards": true,
+      "id": 85,
+      "legend": {
+        "show": false
+      },
+      "links": [],
+      "targets": [
+        {
+          "expr": "sum(rate(synapse_http_server_response_time_seconds_bucket{servlet='RoomSendEventRestServlet',instance=\"$instance\"}[$bucket_size])) by (le)",
+          "format": "heatmap",
+          "intervalFactor": 1,
+          "legendFormat": "{{le}}",
+          "refId": "A"
+        }
+      ],
+      "title": "Event Send Time",
+      "tooltip": {
+        "show": true,
+        "showHistogram": false
+      },
+      "type": "heatmap",
+      "xAxis": {
+        "show": true
+      },
+      "xBucketNumber": null,
+      "xBucketSize": null,
+      "yAxis": {
+        "decimals": null,
+        "format": "s",
+        "logBase": 2,
+        "max": null,
+        "min": null,
+        "show": true,
+        "splitFactor": null
+      },
+      "yBucketBound": "auto",
+      "yBucketNumber": null,
+      "yBucketSize": null
+    },
+    {
+      "aliasColors": {},
+      "bars": false,
+      "dashLength": 10,
+      "dashes": false,
+      "datasource": "$datasource",
+      "editable": true,
+      "error": false,
+      "fill": 1,
+      "grid": {},
+      "gridPos": {
+        "h": 7,
+        "w": 12,
+        "x": 0,
+        "y": 10
+      },
+      "id": 33,
+      "legend": {
+        "avg": false,
+        "current": false,
+        "max": false,
+        "min": false,
+        "show": false,
+        "total": false,
+        "values": false
+      },
+      "lines": true,
+      "linewidth": 2,
+      "links": [],
+      "nullPointMode": "null",
+      "percentage": false,
+      "pointradius": 5,
+      "points": false,
+      "renderer": "flot",
+      "seriesOverrides": [],
+      "spaceLength": 10,
+      "stack": false,
+      "steppedLine": false,
+      "targets": [
+        {
+          "expr": "sum(rate(synapse_storage_events_persisted_events{instance=\"$instance\"}[$bucket_size])) without (job,index)",
+          "format": "time_series",
+          "intervalFactor": 2,
+          "legendFormat": "",
+          "refId": "A",
+          "step": 20,
+          "target": ""
+        }
+      ],
+      "thresholds": [],
+      "timeFrom": null,
+      "timeShift": null,
+      "title": "Events Persisted",
+      "tooltip": {
+        "shared": true,
+        "sort": 0,
+        "value_type": "cumulative"
+      },
+      "type": "graph",
+      "xaxis": {
+        "buckets": null,
+        "mode": "time",
+        "name": null,
+        "show": true,
+        "values": []
+      },
+      "yaxes": [
+        {
+          "format": "hertz",
+          "logBase": 1,
+          "max": null,
+          "min": null,
+          "show": true
+        },
+        {
+          "format": "short",
+          "logBase": 1,
+          "max": null,
+          "min": null,
+          "show": true
+        }
+      ],
+      "yaxis": {
+        "align": false,
+        "alignLevel": null
+      }
+    },
+    {
+      "collapsed": true,
+      "gridPos": {
+        "h": 1,
+        "w": 24,
+        "x": 0,
+        "y": 17
+      },
+      "id": 54,
+      "panels": [
+        {
+          "aliasColors": {},
+          "bars": false,
+          "dashLength": 10,
+          "dashes": false,
+          "datasource": "$datasource",
+          "editable": true,
+          "error": false,
+          "fill": 0,
+          "grid": {},
+          "gridPos": {
+            "h": 7,
+            "w": 12,
+            "x": 0,
+            "y": 18
+          },
+          "id": 34,
+          "legend": {
+            "avg": false,
+            "current": false,
+            "max": false,
+            "min": false,
+            "show": true,
+            "total": false,
+            "values": false
+          },
+          "lines": true,
+          "linewidth": 2,
+          "links": [],
+          "nullPointMode": "null",
+          "percentage": false,
+          "pointradius": 5,
+          "points": false,
+          "renderer": "flot",
+          "seriesOverrides": [],
+          "spaceLength": 10,
+          "stack": false,
+          "steppedLine": true,
+          "targets": [
+            {
+              "expr": "process_resident_memory_bytes{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}",
+              "format": "time_series",
+              "intervalFactor": 2,
+              "legendFormat": "{{job}} {{index}}",
+              "refId": "A",
+              "step": 20,
+              "target": ""
+            }
+          ],
+          "thresholds": [],
+          "timeFrom": null,
+          "timeShift": null,
+          "title": "Memory",
+          "tooltip": {
+            "shared": true,
+            "sort": 0,
+            "value_type": "cumulative"
+          },
+          "type": "graph",
+          "xaxis": {
+            "buckets": null,
+            "mode": "time",
+            "name": null,
+            "show": true,
+            "values": []
+          },
+          "yaxes": [
+            {
+              "format": "bytes",
+              "logBase": 1,
+              "max": null,
+              "min": "0",
+              "show": true
+            },
+            {
+              "format": "short",
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            }
+          ],
+          "yaxis": {
+            "align": false,
+            "alignLevel": null
+          }
+        },
+        {
+          "aliasColors": {},
+          "bars": false,
+          "dashLength": 10,
+          "dashes": false,
+          "datasource": "$datasource",
+          "fill": 1,
+          "gridPos": {
+            "h": 7,
+            "w": 12,
+            "x": 12,
+            "y": 18
+          },
+          "id": 37,
+          "legend": {
+            "avg": false,
+            "current": false,
+            "max": false,
+            "min": false,
+            "show": true,
+            "total": false,
+            "values": false
+          },
+          "lines": true,
+          "linewidth": 1,
+          "links": [],
+          "nullPointMode": "null",
+          "percentage": false,
+          "pointradius": 5,
+          "points": false,
+          "renderer": "flot",
+          "seriesOverrides": [
+            {
+              "alias": "/max$/",
+              "color": "#890F02",
+              "fill": 0,
+              "legend": false
+            }
+          ],
+          "spaceLength": 10,
+          "stack": false,
+          "steppedLine": false,
+          "targets": [
+            {
+              "expr": "process_open_fds{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}",
+              "format": "time_series",
+              "hide": false,
+              "intervalFactor": 2,
+              "legendFormat": "{{job}}-{{index}}",
+              "refId": "A",
+              "step": 20
+            },
+            {
+              "expr": "process_max_fds{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}",
+              "format": "time_series",
+              "hide": true,
+              "intervalFactor": 2,
+              "legendFormat": "{{job}}-{{index}} max",
+              "refId": "B",
+              "step": 20
+            }
+          ],
+          "thresholds": [],
+          "timeFrom": null,
+          "timeShift": null,
+          "title": "Open FDs",
+          "tooltip": {
+            "shared": true,
+            "sort": 0,
+            "value_type": "individual"
+          },
+          "type": "graph",
+          "xaxis": {
+            "buckets": null,
+            "mode": "time",
+            "name": null,
+            "show": true,
+            "values": []
+          },
+          "yaxes": [
+            {
+              "format": "none",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            },
+            {
+              "format": "short",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            }
+          ],
+          "yaxis": {
+            "align": false,
+            "alignLevel": null
+          }
+        },
+        {
+          "aliasColors": {},
+          "bars": false,
+          "dashLength": 10,
+          "dashes": false,
+          "datasource": "$datasource",
+          "fill": 1,
+          "gridPos": {
+            "h": 7,
+            "w": 12,
+            "x": 0,
+            "y": 25
+          },
+          "id": 48,
+          "legend": {
+            "avg": false,
+            "current": false,
+            "max": false,
+            "min": false,
+            "show": true,
+            "total": false,
+            "values": false
+          },
+          "lines": true,
+          "linewidth": 1,
+          "links": [],
+          "nullPointMode": "null",
+          "percentage": false,
+          "pointradius": 5,
+          "points": false,
+          "renderer": "flot",
+          "seriesOverrides": [],
+          "spaceLength": 10,
+          "stack": false,
+          "steppedLine": false,
+          "targets": [
+            {
+              "expr": "rate(synapse_storage_schedule_time_sum{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}[$bucket_size])/rate(synapse_storage_schedule_time_count[$bucket_size])",
+              "format": "time_series",
+              "intervalFactor": 2,
+              "legendFormat": "{{job}}-{{index}}",
+              "refId": "A",
+              "step": 20
+            }
+          ],
+          "thresholds": [],
+          "timeFrom": null,
+          "timeShift": null,
+          "title": "Avg time waiting for db conn",
+          "tooltip": {
+            "shared": true,
+            "sort": 0,
+            "value_type": "individual"
+          },
+          "type": "graph",
+          "xaxis": {
+            "buckets": null,
+            "mode": "time",
+            "name": null,
+            "show": true,
+            "values": []
+          },
+          "yaxes": [
+            {
+              "decimals": null,
+              "format": "s",
+              "label": "",
+              "logBase": 1,
+              "max": null,
+              "min": "0",
+              "show": true
+            },
+            {
+              "format": "short",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": false
+            }
+          ],
+          "yaxis": {
+            "align": false,
+            "alignLevel": null
+          }
+        },
+        {
+          "aliasColors": {},
+          "bars": false,
+          "dashLength": 10,
+          "dashes": false,
+          "datasource": "$datasource",
+          "fill": 1,
+          "gridPos": {
+            "h": 7,
+            "w": 12,
+            "x": 12,
+            "y": 25
+          },
+          "id": 49,
+          "legend": {
+            "avg": false,
+            "current": false,
+            "max": false,
+            "min": false,
+            "show": true,
+            "total": false,
+            "values": false
+          },
+          "lines": true,
+          "linewidth": 1,
+          "links": [],
+          "nullPointMode": "null",
+          "percentage": false,
+          "pointradius": 5,
+          "points": false,
+          "renderer": "flot",
+          "seriesOverrides": [
+            {
+              "alias": "/^up/",
+              "legend": false,
+              "yaxis": 2
+            }
+          ],
+          "spaceLength": 10,
+          "stack": false,
+          "steppedLine": false,
+          "targets": [
+            {
+              "expr": "scrape_duration_seconds{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}",
+              "format": "time_series",
+              "interval": "",
+              "intervalFactor": 2,
+              "legendFormat": "{{job}}-{{index}}",
+              "refId": "A",
+              "step": 20
+            }
+          ],
+          "thresholds": [],
+          "timeFrom": null,
+          "timeShift": null,
+          "title": "Prometheus scrape time",
+          "tooltip": {
+            "shared": true,
+            "sort": 0,
+            "value_type": "individual"
+          },
+          "type": "graph",
+          "xaxis": {
+            "buckets": null,
+            "mode": "time",
+            "name": null,
+            "show": true,
+            "values": []
+          },
+          "yaxes": [
+            {
+              "format": "s",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": "0",
+              "show": true
+            },
+            {
+              "decimals": 0,
+              "format": "none",
+              "label": "",
+              "logBase": 1,
+              "max": "0",
+              "min": "-1",
+              "show": false
+            }
+          ],
+          "yaxis": {
+            "align": false,
+            "alignLevel": null
+          }
+        },
+        {
+          "aliasColors": {},
+          "bars": false,
+          "dashLength": 10,
+          "dashes": false,
+          "datasource": "$datasource",
+          "fill": 1,
+          "gridPos": {
+            "h": 7,
+            "w": 12,
+            "x": 0,
+            "y": 32
+          },
+          "id": 50,
+          "legend": {
+            "avg": false,
+            "current": false,
+            "max": false,
+            "min": false,
+            "show": true,
+            "total": false,
+            "values": false
+          },
+          "lines": true,
+          "linewidth": 1,
+          "links": [],
+          "nullPointMode": "null",
+          "percentage": false,
+          "pointradius": 5,
+          "points": false,
+          "renderer": "flot",
+          "seriesOverrides": [],
+          "spaceLength": 10,
+          "stack": false,
+          "steppedLine": false,
+          "targets": [
+            {
+              "expr": "rate(python_twisted_reactor_tick_time_sum{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}[$bucket_size])/rate(python_twisted_reactor_tick_time_count[$bucket_size])",
+              "format": "time_series",
+              "interval": "",
+              "intervalFactor": 2,
+              "legendFormat": "{{job}}-{{index}}",
+              "refId": "A",
+              "step": 20
+            }
+          ],
+          "thresholds": [],
+          "timeFrom": null,
+          "timeShift": null,
+          "title": "Avg reactor tick time",
+          "tooltip": {
+            "shared": true,
+            "sort": 0,
+            "value_type": "individual"
+          },
+          "type": "graph",
+          "xaxis": {
+            "buckets": null,
+            "mode": "time",
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+          "id": 87,
+          "legend": {
+            "show": true
+          },
+          "links": [],
+          "targets": [
+            {
+              "expr": "sum(rate(python_gc_time_bucket[$bucket_size])) by (le)",
+              "format": "heatmap",
+              "intervalFactor": 1,
+              "legendFormat": "{{le}}",
+              "refId": "A"
+            }
+          ],
+          "title": "GC durations",
+          "tooltip": {
+            "show": true,
+            "showHistogram": false
+          },
+          "type": "heatmap",
+          "xAxis": {
+            "show": true
+          },
+          "xBucketNumber": null,
+          "xBucketSize": null,
+          "yAxis": {
+            "decimals": null,
+            "format": "s",
+            "logBase": 1,
+            "max": null,
+            "min": null,
+            "show": true,
+            "splitFactor": null
+          },
+          "yBucketBound": "auto",
+          "yBucketNumber": null,
+          "yBucketSize": null
+        }
+      ],
+      "repeat": null,
+      "title": "GC",
+      "type": "row"
+    },
+    {
+      "collapsed": true,
+      "gridPos": {
+        "h": 1,
+        "w": 24,
+        "x": 0,
+        "y": 27
+      },
+      "id": 63,
+      "panels": [
+        {
+          "aliasColors": {},
+          "bars": false,
+          "dashLength": 10,
+          "dashes": false,
+          "datasource": "${DS_PROMETHEUS}",
+          "fill": 1,
+          "gridPos": {
+            "h": 7,
+            "w": 12,
+            "x": 0,
+            "y": 19
+          },
+          "id": 2,
+          "legend": {
+            "avg": false,
+            "current": false,
+            "max": false,
+            "min": false,
+            "show": true,
+            "total": false,
+            "values": false
+          },
+          "lines": true,
+          "linewidth": 1,
+          "links": [],
+          "nullPointMode": "null",
+          "percentage": false,
+          "pointradius": 5,
+          "points": false,
+          "renderer": "flot",
+          "seriesOverrides": [],
+          "spaceLength": 10,
+          "stack": false,
+          "steppedLine": false,
+          "targets": [
+            {
+              "expr": "rate(synapse_replication_tcp_resource_user_sync{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}[$bucket_size])",
+              "format": "time_series",
+              "intervalFactor": 2,
+              "legendFormat": "user started/stopped syncing",
+              "refId": "A",
+              "step": 20
+            },
+            {
+              "expr": "rate(synapse_replication_tcp_resource_federation_ack{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}[$bucket_size])",
+              "format": "time_series",
+              "intervalFactor": 2,
+              "legendFormat": "federation ack",
+              "refId": "B",
+              "step": 20
+            },
+            {
+              "expr": "rate(synapse_replication_tcp_resource_remove_pusher{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}[$bucket_size])",
+              "format": "time_series",
+              "intervalFactor": 2,
+              "legendFormat": "remove pusher",
+              "refId": "C",
+              "step": 20
+            },
+            {
+              "expr": "rate(synapse_replication_tcp_resource_invalidate_cache{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}[$bucket_size])",
+              "format": "time_series",
+              "intervalFactor": 2,
+              "legendFormat": "invalidate cache",
+              "refId": "D",
+              "step": 20
+            },
+            {
+              "expr": "rate(synapse_replication_tcp_resource_user_ip_cache{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}[$bucket_size])",
+              "format": "time_series",
+              "intervalFactor": 2,
+              "legendFormat": "user ip cache",
+              "refId": "E",
+              "step": 20
+            }
+          ],
+          "thresholds": [],
+          "timeFrom": null,
+          "timeShift": null,
+          "title": "Rate of events on replication master",
+          "tooltip": {
+            "shared": true,
+            "sort": 0,
+            "value_type": "individual"
+          },
+          "type": "graph",
+          "xaxis": {
+            "buckets": null,
+            "mode": "time",
+            "name": null,
+            "show": true,
+            "values": []
+          },
+          "yaxes": [
+            {
+              "format": "hertz",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            },
+            {
+              "format": "short",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            }
+          ]
+        },
+        {
+          "aliasColors": {},
+          "bars": false,
+          "dashLength": 10,
+          "dashes": false,
+          "datasource": "${DS_PROMETHEUS}",
+          "fill": 1,
+          "gridPos": {
+            "h": 7,
+            "w": 12,
+            "x": 12,
+            "y": 19
+          },
+          "id": 41,
+          "legend": {
+            "avg": false,
+            "current": false,
+            "max": false,
+            "min": false,
+            "show": true,
+            "total": false,
+            "values": false
+          },
+          "lines": true,
+          "linewidth": 1,
+          "links": [],
+          "nullPointMode": "null",
+          "percentage": false,
+          "pointradius": 5,
+          "points": false,
+          "renderer": "flot",
+          "seriesOverrides": [],
+          "spaceLength": 10,
+          "stack": false,
+          "steppedLine": false,
+          "targets": [
+            {
+              "expr": "rate(synapse_replication_tcp_resource_stream_updates{job=~\"$job\",index=~\"$index\",instance=\"$instance\"}[$bucket_size])",
+              "format": "time_series",
+              "interval": "",
+              "intervalFactor": 2,
+              "legendFormat": "{{stream_name}}",
+              "refId": "A",
+              "step": 20
+            }
+          ],
+          "thresholds": [],
+          "timeFrom": null,
+          "timeShift": null,
+          "title": "Outgoing stream updates",
+          "tooltip": {
+            "shared": true,
+            "sort": 0,
+            "value_type": "individual"
+          },
+          "type": "graph",
+          "xaxis": {
+            "buckets": null,
+            "mode": "time",
+            "name": null,
+            "show": true,
+            "values": []
+          },
+          "yaxes": [
+            {
+              "format": "hertz",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            },
+            {
+              "format": "short",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            }
+          ]
+        },
+        {
+          "aliasColors": {},
+          "bars": false,
+          "dashLength": 10,
+          "dashes": false,
+          "datasource": "${DS_PROMETHEUS}",
+          "fill": 1,
+          "gridPos": {
+            "h": 7,
+            "w": 12,
+            "x": 0,
+            "y": 26
+          },
+          "id": 42,
+          "legend": {
+            "avg": false,
+            "current": false,
+            "max": false,
+            "min": false,
+            "show": true,
+            "total": false,
+            "values": false
+          },
+          "lines": true,
+          "linewidth": 1,
+          "links": [],
+          "nullPointMode": "null",
+          "percentage": false,
+          "pointradius": 5,
+          "points": false,
+          "renderer": "flot",
+          "seriesOverrides": [],
+          "spaceLength": 10,
+          "stack": false,
+          "steppedLine": false,
+          "targets": [
+            {
+              "expr": "sum (rate(synapse_replication_tcp_protocol_inbound_commands{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}[$bucket_size])) without (name, conn_id)",
+              "format": "time_series",
+              "intervalFactor": 2,
+              "legendFormat": "{{job}}-{{index}} {{command}}",
+              "refId": "A",
+              "step": 20
+            }
+          ],
+          "thresholds": [],
+          "timeFrom": null,
+          "timeShift": null,
+          "title": "Rate of incoming commands",
+          "tooltip": {
+            "shared": true,
+            "sort": 0,
+            "value_type": "individual"
+          },
+          "type": "graph",
+          "xaxis": {
+            "buckets": null,
+            "mode": "time",
+            "name": null,
+            "show": true,
+            "values": []
+          },
+          "yaxes": [
+            {
+              "format": "hertz",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            },
+            {
+              "format": "short",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            }
+          ]
+        },
+        {
+          "aliasColors": {},
+          "bars": false,
+          "dashLength": 10,
+          "dashes": false,
+          "datasource": "${DS_PROMETHEUS}",
+          "fill": 1,
+          "gridPos": {
+            "h": 7,
+            "w": 12,
+            "x": 12,
+            "y": 26
+          },
+          "id": 43,
+          "legend": {
+            "avg": false,
+            "current": false,
+            "max": false,
+            "min": false,
+            "show": true,
+            "total": false,
+            "values": false
+          },
+          "lines": true,
+          "linewidth": 1,
+          "links": [],
+          "nullPointMode": "null",
+          "percentage": false,
+          "pointradius": 5,
+          "points": false,
+          "renderer": "flot",
+          "seriesOverrides": [],
+          "spaceLength": 10,
+          "stack": false,
+          "steppedLine": false,
+          "targets": [
+            {
+              "expr": "sum (rate(synapse_replication_tcp_protocol_outbound_commands{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}[$bucket_size])) without (name, conn_id)",
+              "format": "time_series",
+              "intervalFactor": 2,
+              "legendFormat": "{{job}}-{{index}} {{command}}",
+              "refId": "A",
+              "step": 20
+            }
+          ],
+          "thresholds": [],
+          "timeFrom": null,
+          "timeShift": null,
+          "title": "Rate of outgoing commands",
+          "tooltip": {
+            "shared": true,
+            "sort": 0,
+            "value_type": "individual"
+          },
+          "type": "graph",
+          "xaxis": {
+            "buckets": null,
+            "mode": "time",
+            "name": null,
+            "show": true,
+            "values": []
+          },
+          "yaxes": [
+            {
+              "format": "hertz",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            },
+            {
+              "format": "short",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            }
+          ]
+        }
+      ],
+      "repeat": null,
+      "title": "Replication",
+      "type": "row"
+    },
+    {
+      "collapsed": true,
+      "gridPos": {
+        "h": 1,
+        "w": 24,
+        "x": 0,
+        "y": 28
+      },
+      "id": 69,
+      "panels": [
+        {
+          "aliasColors": {},
+          "bars": false,
+          "dashLength": 10,
+          "dashes": false,
+          "datasource": "${DS_PROMETHEUS}",
+          "fill": 1,
+          "gridPos": {
+            "h": 9,
+            "w": 12,
+            "x": 0,
+            "y": 11
+          },
+          "id": 67,
+          "legend": {
+            "avg": false,
+            "current": false,
+            "max": false,
+            "min": false,
+            "show": true,
+            "total": false,
+            "values": false
+          },
+          "lines": true,
+          "linewidth": 1,
+          "links": [],
+          "nullPointMode": "null",
+          "percentage": false,
+          "pointradius": 5,
+          "points": false,
+          "renderer": "flot",
+          "seriesOverrides": [],
+          "spaceLength": 10,
+          "stack": false,
+          "steppedLine": false,
+          "targets": [
+            {
+              "expr": " synapse_event_persisted_position{instance=\"$instance\"} - ignoring(index, job, name) group_right(instance) synapse_event_processing_positions{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}",
+              "format": "time_series",
+              "interval": "",
+              "intervalFactor": 1,
+              "legendFormat": "{{job}}-{{index}}",
+              "refId": "A"
+            }
+          ],
+          "thresholds": [],
+          "timeFrom": null,
+          "timeShift": null,
+          "title": "Event processing lag",
+          "tooltip": {
+            "shared": true,
+            "sort": 0,
+            "value_type": "individual"
+          },
+          "type": "graph",
+          "xaxis": {
+            "buckets": null,
+            "mode": "time",
+            "name": null,
+            "show": true,
+            "values": []
+          },
+          "yaxes": [
+            {
+              "format": "short",
+              "label": "events",
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            },
+            {
+              "format": "short",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            }
+          ]
+        },
+        {
+          "aliasColors": {},
+          "bars": false,
+          "dashLength": 10,
+          "dashes": false,
+          "datasource": "${DS_PROMETHEUS}",
+          "fill": 1,
+          "gridPos": {
+            "h": 9,
+            "w": 12,
+            "x": 12,
+            "y": 11
+          },
+          "id": 71,
+          "legend": {
+            "avg": false,
+            "current": false,
+            "max": false,
+            "min": false,
+            "show": true,
+            "total": false,
+            "values": false
+          },
+          "lines": true,
+          "linewidth": 1,
+          "links": [],
+          "nullPointMode": "null",
+          "percentage": false,
+          "pointradius": 5,
+          "points": false,
+          "renderer": "flot",
+          "seriesOverrides": [],
+          "spaceLength": 10,
+          "stack": false,
+          "steppedLine": false,
+          "targets": [
+            {
+              "expr": "time()*1000-synapse_event_processing_last_ts{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}",
+              "format": "time_series",
+              "hide": false,
+              "intervalFactor": 1,
+              "legendFormat": "{{job}}-{{index}} {{name}}",
+              "refId": "B"
+            }
+          ],
+          "thresholds": [],
+          "timeFrom": null,
+          "timeShift": null,
+          "title": "Age of last processed event",
+          "tooltip": {
+            "shared": true,
+            "sort": 0,
+            "value_type": "individual"
+          },
+          "type": "graph",
+          "xaxis": {
+            "buckets": null,
+            "mode": "time",
+            "name": null,
+            "show": true,
+            "values": []
+          },
+          "yaxes": [
+            {
+              "format": "ms",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            },
+            {
+              "format": "short",
+              "label": null,
+              "logBase": 1,
+              "max": null,
+              "min": null,
+              "show": true
+            }
+          ]
+        }
+      ],
+      "title": "Event processing loop positions",
+      "type": "row"
+    }
+  ],
+  "refresh": "1m",
+  "schemaVersion": 16,
+  "style": "dark",
+  "tags": [
+    "matrix"
+  ],
+  "templating": {
+    "list": [
+      {
+        "current": {
+          "text": "Prometheus",
+          "value": "Prometheus"
+        },
+        "hide": 0,
+        "label": null,
+        "name": "datasource",
+        "options": [],
+        "query": "prometheus",
+        "refresh": 1,
+        "regex": "",
+        "type": "datasource"
+      },
+      {
+        "allFormat": "glob",
+        "auto": true,
+        "auto_count": 100,
+        "auto_min": "30s",
+        "current": {
+          "text": "auto",
+          "value": "$__auto_interval_bucket_size"
+        },
+        "datasource": null,
+        "hide": 0,
+        "includeAll": false,
+        "label": "Bucket Size",
+        "multi": false,
+        "multiFormat": "glob",
+        "name": "bucket_size",
+        "options": [
+          {
+            "selected": true,
+            "text": "auto",
+            "value": "$__auto_interval_bucket_size"
+          },
+          {
+            "selected": false,
+            "text": "30s",
+            "value": "30s"
+          },
+          {
+            "selected": false,
+            "text": "1m",
+            "value": "1m"
+          },
+          {
+            "selected": false,
+            "text": "2m",
+            "value": "2m"
+          },
+          {
+            "selected": false,
+            "text": "5m",
+            "value": "5m"
+          }
+        ],
+        "query": "30s,1m,2m,5m",
+        "refresh": 2,
+        "type": "interval"
+      },
+      {
+        "allValue": null,
+        "current": {},
+        "datasource": "$datasource",
+        "hide": 0,
+        "includeAll": false,
+        "label": null,
+        "multi": false,
+        "name": "instance",
+        "options": [],
+        "query": "label_values(process_cpu_user_seconds_total{job=~\"synapse.*\"}, instance)",
+        "refresh": 2,
+        "regex": "",
+        "sort": 0,
+        "tagValuesQuery": "",
+        "tags": [],
+        "tagsQuery": "",
+        "type": "query",
+        "useTags": false
+      },
+      {
+        "allFormat": "regex wildcard",
+        "allValue": "",
+        "current": {},
+        "datasource": "$datasource",
+        "hide": 0,
+        "hideLabel": false,
+        "includeAll": true,
+        "label": "Job",
+        "multi": true,
+        "multiFormat": "regex values",
+        "name": "job",
+        "options": [],
+        "query": "label_values(process_cpu_user_seconds_total{job=~\"synapse.*\"}, job)",
+        "refresh": 2,
+        "refresh_on_load": false,
+        "regex": "",
+        "sort": 1,
+        "tagValuesQuery": "",
+        "tags": [],
+        "tagsQuery": "",
+        "type": "query",
+        "useTags": false
+      },
+      {
+        "allFormat": "regex wildcard",
+        "allValue": ".*",
+        "current": {},
+        "datasource": "$datasource",
+        "hide": 0,
+        "hideLabel": false,
+        "includeAll": true,
+        "label": "",
+        "multi": true,
+        "multiFormat": "regex values",
+        "name": "index",
+        "options": [],
+        "query": "label_values(process_cpu_user_seconds_total{job=~\"synapse.*\"}, index)",
+        "refresh": 2,
+        "refresh_on_load": false,
+        "regex": "",
+        "sort": 3,
+        "tagValuesQuery": "",
+        "tags": [],
+        "tagsQuery": "",
+        "type": "query",
+        "useTags": false
+      }
+    ]
+  },
+  "time": {
+    "from": "now-1h",
+    "to": "now"
+  },
+  "timepicker": {
+    "now": true,
+    "refresh_intervals": [
+      "5s",
+      "10s",
+      "30s",
+      "1m",
+      "5m",
+      "15m",
+      "30m",
+      "1h",
+      "2h",
+      "1d"
+    ],
+    "time_options": [
+      "5m",
+      "15m",
+      "1h",
+      "6h",
+      "12h",
+      "24h",
+      "2d",
+      "7d",
+      "30d"
+    ]
+  },
+  "timezone": "",
+  "title": "Synapse",
+  "uid": "000000012",
+  "version": 125
+}
\ No newline at end of file
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index e501251b6e..657935d1ac 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -207,10 +207,6 @@ class FederationServer(FederationBase):
                     edu.content
                 )
 
-        pdu_failures = getattr(transaction, "pdu_failures", [])
-        for fail in pdu_failures:
-            logger.info("Got failure %r", fail)
-
         response = {
             "pdus": pdu_results,
         }
diff --git a/synapse/federation/send_queue.py b/synapse/federation/send_queue.py
index 5157c3860d..0bb468385d 100644
--- a/synapse/federation/send_queue.py
+++ b/synapse/federation/send_queue.py
@@ -62,8 +62,6 @@ class FederationRemoteSendQueue(object):
 
         self.edus = SortedDict()  # stream position -> Edu
 
-        self.failures = SortedDict()  # stream position -> (destination, Failure)
-
         self.device_messages = SortedDict()  # stream position -> destination
 
         self.pos = 1
@@ -79,7 +77,7 @@ class FederationRemoteSendQueue(object):
 
         for queue_name in [
             "presence_map", "presence_changed", "keyed_edu", "keyed_edu_changed",
-            "edus", "failures", "device_messages", "pos_time",
+            "edus", "device_messages", "pos_time",
         ]:
             register(queue_name, getattr(self, queue_name))
 
@@ -149,12 +147,6 @@ class FederationRemoteSendQueue(object):
             for key in keys[:i]:
                 del self.edus[key]
 
-            # Delete things out of failure map
-            keys = self.failures.keys()
-            i = self.failures.bisect_left(position_to_delete)
-            for key in keys[:i]:
-                del self.failures[key]
-
             # Delete things out of device map
             keys = self.device_messages.keys()
             i = self.device_messages.bisect_left(position_to_delete)
@@ -204,13 +196,6 @@ class FederationRemoteSendQueue(object):
 
         self.notifier.on_new_replication_data()
 
-    def send_failure(self, failure, destination):
-        """As per TransactionQueue"""
-        pos = self._next_pos()
-
-        self.failures[pos] = (destination, str(failure))
-        self.notifier.on_new_replication_data()
-
     def send_device_messages(self, destination):
         """As per TransactionQueue"""
         pos = self._next_pos()
@@ -285,17 +270,6 @@ class FederationRemoteSendQueue(object):
         for (pos, edu) in edus:
             rows.append((pos, EduRow(edu)))
 
-        # Fetch changed failures
-        i = self.failures.bisect_right(from_token)
-        j = self.failures.bisect_right(to_token) + 1
-        failures = self.failures.items()[i:j]
-
-        for (pos, (destination, failure)) in failures:
-            rows.append((pos, FailureRow(
-                destination=destination,
-                failure=failure,
-            )))
-
         # Fetch changed device messages
         i = self.device_messages.bisect_right(from_token)
         j = self.device_messages.bisect_right(to_token) + 1
@@ -417,34 +391,6 @@ class EduRow(BaseFederationRow, namedtuple("EduRow", (
         buff.edus.setdefault(self.edu.destination, []).append(self.edu)
 
 
-class FailureRow(BaseFederationRow, namedtuple("FailureRow", (
-    "destination",  # str
-    "failure",
-))):
-    """Streams failures to a remote server. Failures are issued when there was
-    something wrong with a transaction the remote sent us, e.g. it included
-    an event that was invalid.
-    """
-
-    TypeId = "f"
-
-    @staticmethod
-    def from_data(data):
-        return FailureRow(
-            destination=data["destination"],
-            failure=data["failure"],
-        )
-
-    def to_data(self):
-        return {
-            "destination": self.destination,
-            "failure": self.failure,
-        }
-
-    def add_to_buffer(self, buff):
-        buff.failures.setdefault(self.destination, []).append(self.failure)
-
-
 class DeviceRow(BaseFederationRow, namedtuple("DeviceRow", (
     "destination",  # str
 ))):
@@ -471,7 +417,6 @@ TypeToRow = {
         PresenceRow,
         KeyedEduRow,
         EduRow,
-        FailureRow,
         DeviceRow,
     )
 }
@@ -481,7 +426,6 @@ ParsedFederationStreamData = namedtuple("ParsedFederationStreamData", (
     "presence",  # list(UserPresenceState)
     "keyed_edus",  # dict of destination -> { key -> Edu }
     "edus",  # dict of destination -> [Edu]
-    "failures",  # dict of destination -> [failures]
     "device_destinations",  # set of destinations
 ))
 
@@ -503,7 +447,6 @@ def process_rows_for_federation(transaction_queue, rows):
         presence=[],
         keyed_edus={},
         edus={},
-        failures={},
         device_destinations=set(),
     )
 
@@ -532,9 +475,5 @@ def process_rows_for_federation(transaction_queue, rows):
                 edu.destination, edu.edu_type, edu.content, key=None,
             )
 
-    for destination, failure_list in iteritems(buff.failures):
-        for failure in failure_list:
-            transaction_queue.send_failure(destination, failure)
-
     for destination in buff.device_destinations:
         transaction_queue.send_device_messages(destination)
diff --git a/synapse/federation/transaction_queue.py b/synapse/federation/transaction_queue.py
index 6996d6b695..78f9d40a3a 100644
--- a/synapse/federation/transaction_queue.py
+++ b/synapse/federation/transaction_queue.py
@@ -116,9 +116,6 @@ class TransactionQueue(object):
             ),
         )
 
-        # destination -> list of tuple(failure, deferred)
-        self.pending_failures_by_dest = {}
-
         # destination -> stream_id of last successfully sent to-device message.
         # NB: may be a long or an int.
         self.last_device_stream_id_by_dest = {}
@@ -382,19 +379,6 @@ class TransactionQueue(object):
 
         self._attempt_new_transaction(destination)
 
-    def send_failure(self, failure, destination):
-        if destination == self.server_name or destination == "localhost":
-            return
-
-        if not self.can_send_to(destination):
-            return
-
-        self.pending_failures_by_dest.setdefault(
-            destination, []
-        ).append(failure)
-
-        self._attempt_new_transaction(destination)
-
     def send_device_messages(self, destination):
         if destination == self.server_name or destination == "localhost":
             return
@@ -469,7 +453,6 @@ class TransactionQueue(object):
                 pending_pdus = self.pending_pdus_by_dest.pop(destination, [])
                 pending_edus = self.pending_edus_by_dest.pop(destination, [])
                 pending_presence = self.pending_presence_by_dest.pop(destination, {})
-                pending_failures = self.pending_failures_by_dest.pop(destination, [])
 
                 pending_edus.extend(
                     self.pending_edus_keyed_by_dest.pop(destination, {}).values()
@@ -497,7 +480,7 @@ class TransactionQueue(object):
                     logger.debug("TX [%s] len(pending_pdus_by_dest[dest]) = %d",
                                  destination, len(pending_pdus))
 
-                if not pending_pdus and not pending_edus and not pending_failures:
+                if not pending_pdus and not pending_edus:
                     logger.debug("TX [%s] Nothing to send", destination)
                     self.last_device_stream_id_by_dest[destination] = (
                         device_stream_id
@@ -507,7 +490,7 @@ class TransactionQueue(object):
                 # END CRITICAL SECTION
 
                 success = yield self._send_new_transaction(
-                    destination, pending_pdus, pending_edus, pending_failures,
+                    destination, pending_pdus, pending_edus,
                 )
                 if success:
                     sent_transactions_counter.inc()
@@ -584,14 +567,12 @@ class TransactionQueue(object):
 
     @measure_func("_send_new_transaction")
     @defer.inlineCallbacks
-    def _send_new_transaction(self, destination, pending_pdus, pending_edus,
-                              pending_failures):
+    def _send_new_transaction(self, destination, pending_pdus, pending_edus):
 
         # Sort based on the order field
         pending_pdus.sort(key=lambda t: t[1])
         pdus = [x[0] for x in pending_pdus]
         edus = pending_edus
-        failures = [x.get_dict() for x in pending_failures]
 
         success = True
 
@@ -601,11 +582,10 @@ class TransactionQueue(object):
 
         logger.debug(
             "TX [%s] {%s} Attempting new transaction"
-            " (pdus: %d, edus: %d, failures: %d)",
+            " (pdus: %d, edus: %d)",
             destination, txn_id,
             len(pdus),
             len(edus),
-            len(failures)
         )
 
         logger.debug("TX [%s] Persisting transaction...", destination)
@@ -617,7 +597,6 @@ class TransactionQueue(object):
             destination=destination,
             pdus=pdus,
             edus=edus,
-            pdu_failures=failures,
         )
 
         self._next_txn_id += 1
@@ -627,12 +606,11 @@ class TransactionQueue(object):
         logger.debug("TX [%s] Persisted transaction", destination)
         logger.info(
             "TX [%s] {%s} Sending transaction [%s],"
-            " (PDUs: %d, EDUs: %d, failures: %d)",
+            " (PDUs: %d, EDUs: %d)",
             destination, txn_id,
             transaction.transaction_id,
             len(pdus),
             len(edus),
-            len(failures),
         )
 
         # Actually send the transaction
diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py
index 8574898f0c..3b5ea9515a 100644
--- a/synapse/federation/transport/server.py
+++ b/synapse/federation/transport/server.py
@@ -283,11 +283,10 @@ class FederationSendServlet(BaseFederationServlet):
             )
 
             logger.info(
-                "Received txn %s from %s. (PDUs: %d, EDUs: %d, failures: %d)",
+                "Received txn %s from %s. (PDUs: %d, EDUs: %d)",
                 transaction_id, origin,
                 len(transaction_data.get("pdus", [])),
                 len(transaction_data.get("edus", [])),
-                len(transaction_data.get("failures", [])),
             )
 
             # We should ideally be getting this from the security layer.
diff --git a/synapse/federation/units.py b/synapse/federation/units.py
index bb1b3b13f7..c5ab14314e 100644
--- a/synapse/federation/units.py
+++ b/synapse/federation/units.py
@@ -73,7 +73,6 @@ class Transaction(JsonEncodedObject):
         "previous_ids",
         "pdus",
         "edus",
-        "pdu_failures",
     ]
 
     internal_keys = [
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 003b848c00..7b7804d9b2 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -15,6 +15,7 @@
 # limitations under the License.
 
 """Contains functions for performing events on rooms."""
+import itertools
 import logging
 import math
 import string
@@ -401,7 +402,7 @@ class RoomContextHandler(object):
         self.store = hs.get_datastore()
 
     @defer.inlineCallbacks
-    def get_event_context(self, user, room_id, event_id, limit):
+    def get_event_context(self, user, room_id, event_id, limit, event_filter):
         """Retrieves events, pagination tokens and state around a given event
         in a room.
 
@@ -411,6 +412,8 @@ class RoomContextHandler(object):
             event_id (str)
             limit (int): The maximum number of events to return in total
                 (excluding state).
+            event_filter (Filter|None): the filter to apply to the events returned
+                (excluding the target event_id)
 
         Returns:
             dict, or None if the event isn't found
@@ -443,7 +446,7 @@ class RoomContextHandler(object):
             )
 
         results = yield self.store.get_events_around(
-            room_id, event_id, before_limit, after_limit
+            room_id, event_id, before_limit, after_limit, event_filter
         )
 
         results["events_before"] = yield filter_evts(results["events_before"])
@@ -455,8 +458,23 @@ class RoomContextHandler(object):
         else:
             last_event_id = event_id
 
+        types = None
+        filtered_types = None
+        if event_filter and event_filter.lazy_load_members():
+            members = set(ev.sender for ev in itertools.chain(
+                results["events_before"],
+                (results["event"],),
+                results["events_after"],
+            ))
+            filtered_types = [EventTypes.Member]
+            types = [(EventTypes.Member, member) for member in members]
+
+        # XXX: why do we return the state as of the last event rather than the
+        # first? Shouldn't we be consistent with /sync?
+        # https://github.com/matrix-org/matrix-doc/issues/687
+
         state = yield self.store.get_state_for_events(
-            [last_event_id], None
+            [last_event_id], types, filtered_types=filtered_types,
         )
         results["state"] = list(state[last_event_id].values())
 
diff --git a/synapse/handlers/search.py b/synapse/handlers/search.py
index 69ae9731d5..c464adbd0b 100644
--- a/synapse/handlers/search.py
+++ b/synapse/handlers/search.py
@@ -287,7 +287,7 @@ class SearchHandler(BaseHandler):
             contexts = {}
             for event in allowed_events:
                 res = yield self.store.get_events_around(
-                    event.room_id, event.event_id, before_limit, after_limit
+                    event.room_id, event.event_id, before_limit, after_limit,
                 )
 
                 logger.info(
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index b7bd878c90..13c331550b 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -531,11 +531,20 @@ class RoomEventContextServlet(ClientV1RestServlet):
 
         limit = parse_integer(request, "limit", default=10)
 
+        # picking the API shape for symmetry with /messages
+        filter_bytes = parse_string(request, "filter")
+        if filter_bytes:
+            filter_json = urlparse.unquote(filter_bytes).decode("UTF-8")
+            event_filter = Filter(json.loads(filter_json))
+        else:
+            event_filter = None
+
         results = yield self.room_context_handler.get_event_context(
             requester.user,
             room_id,
             event_id,
             limit,
+            event_filter,
         )
 
         if not results:
diff --git a/synapse/secrets.py b/synapse/secrets.py
index f397daaa5e..f05e9ea535 100644
--- a/synapse/secrets.py
+++ b/synapse/secrets.py
@@ -20,17 +20,16 @@ See https://docs.python.org/3/library/secrets.html#module-secrets for the API
 used in Python 3.6, and the API emulated in Python 2.7.
 """
 
-import six
+import sys
 
-if six.PY3:
+# secrets is available since python 3.6
+if sys.version_info[0:2] >= (3, 6):
     import secrets
 
     def Secrets():
         return secrets
 
-
 else:
-
     import os
     import binascii
 
diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index ba88a54979..3bd63cd195 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -66,6 +66,7 @@ class DataStore(RoomMemberStore, RoomStore,
                 PresenceStore, TransactionStore,
                 DirectoryStore, KeyStore, StateStore, SignatureStore,
                 ApplicationServiceStore,
+                EventsStore,
                 EventFederationStore,
                 MediaRepositoryStore,
                 RejectionsStore,
@@ -73,7 +74,6 @@ class DataStore(RoomMemberStore, RoomStore,
                 PusherStore,
                 PushRuleStore,
                 ApplicationServiceTransactionStore,
-                EventsStore,
                 ReceiptsStore,
                 EndToEndKeyStore,
                 SearchStore,
diff --git a/synapse/storage/appservice.py b/synapse/storage/appservice.py
index 9f12b360bc..31248d5e06 100644
--- a/synapse/storage/appservice.py
+++ b/synapse/storage/appservice.py
@@ -22,7 +22,7 @@ from twisted.internet import defer
 
 from synapse.appservice import AppServiceTransaction
 from synapse.config.appservice import load_appservices
-from synapse.storage.events import EventsWorkerStore
+from synapse.storage.events_worker import EventsWorkerStore
 
 from ._base import SQLBaseStore
 
diff --git a/synapse/storage/event_federation.py b/synapse/storage/event_federation.py
index 5d3ee90017..8bd35df119 100644
--- a/synapse/storage/event_federation.py
+++ b/synapse/storage/event_federation.py
@@ -25,7 +25,7 @@ from twisted.internet import defer
 from synapse.api.errors import StoreError
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.storage._base import SQLBaseStore
-from synapse.storage.events import EventsWorkerStore
+from synapse.storage.events_worker import EventsWorkerStore
 from synapse.storage.signatures import SignatureWorkerStore
 from synapse.util.caches.descriptors import cached
 
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index 2f482af3a1..c98e524ba1 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -34,6 +34,8 @@ from synapse.api.errors import SynapseError
 from synapse.events import EventBase  # noqa: F401
 from synapse.events.snapshot import EventContext  # noqa: F401
 from synapse.metrics.background_process_metrics import run_as_background_process
+from synapse.storage.background_updates import BackgroundUpdateStore
+from synapse.storage.event_federation import EventFederationStore
 from synapse.storage.events_worker import EventsWorkerStore
 from synapse.types import RoomStreamToken, get_domain_from_id
 from synapse.util.async import ObservableDeferred
@@ -193,7 +195,9 @@ def _retry_on_integrity_error(func):
     return f
 
 
-class EventsStore(EventsWorkerStore):
+# inherits from EventFederationStore so that we can call _update_backward_extremities
+# and _handle_mult_prev_events (though arguably those could both be moved in here)
+class EventsStore(EventFederationStore, EventsWorkerStore, BackgroundUpdateStore):
     EVENT_ORIGIN_SERVER_TS_NAME = "event_origin_server_ts"
     EVENT_FIELDS_SENDER_URL_UPDATE_NAME = "event_fields_sender_url"
 
diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py
index 027bf8c85e..10dce21cea 100644
--- a/synapse/storage/roommember.py
+++ b/synapse/storage/roommember.py
@@ -24,7 +24,7 @@ from canonicaljson import json
 from twisted.internet import defer
 
 from synapse.api.constants import EventTypes, Membership
-from synapse.storage.events import EventsWorkerStore
+from synapse.storage.events_worker import EventsWorkerStore
 from synapse.types import get_domain_from_id
 from synapse.util.async import Linearizer
 from synapse.util.caches import intern_string
diff --git a/synapse/storage/stream.py b/synapse/storage/stream.py
index 66856342f0..b9f2b74ac6 100644
--- a/synapse/storage/stream.py
+++ b/synapse/storage/stream.py
@@ -43,7 +43,7 @@ from twisted.internet import defer
 
 from synapse.storage._base import SQLBaseStore
 from synapse.storage.engines import PostgresEngine
-from synapse.storage.events import EventsWorkerStore
+from synapse.storage.events_worker import EventsWorkerStore
 from synapse.types import RoomStreamToken
 from synapse.util.caches.stream_change_cache import StreamChangeCache
 from synapse.util.logcontext import make_deferred_yieldable, run_in_background
@@ -527,7 +527,9 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
             )
 
     @defer.inlineCallbacks
-    def get_events_around(self, room_id, event_id, before_limit, after_limit):
+    def get_events_around(
+        self, room_id, event_id, before_limit, after_limit, event_filter=None,
+    ):
         """Retrieve events and pagination tokens around a given event in a
         room.
 
@@ -536,6 +538,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
             event_id (str)
             before_limit (int)
             after_limit (int)
+            event_filter (Filter|None)
 
         Returns:
             dict
@@ -543,7 +546,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
 
         results = yield self.runInteraction(
             "get_events_around", self._get_events_around_txn,
-            room_id, event_id, before_limit, after_limit
+            room_id, event_id, before_limit, after_limit, event_filter,
         )
 
         events_before = yield self._get_events(
@@ -563,7 +566,9 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
             "end": results["after"]["token"],
         })
 
-    def _get_events_around_txn(self, txn, room_id, event_id, before_limit, after_limit):
+    def _get_events_around_txn(
+        self, txn, room_id, event_id, before_limit, after_limit, event_filter,
+    ):
         """Retrieves event_ids and pagination tokens around a given event in a
         room.
 
@@ -572,6 +577,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
             event_id (str)
             before_limit (int)
             after_limit (int)
+            event_filter (Filter|None)
 
         Returns:
             dict
@@ -601,11 +607,13 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
 
         rows, start_token = self._paginate_room_events_txn(
             txn, room_id, before_token, direction='b', limit=before_limit,
+            event_filter=event_filter,
         )
         events_before = [r.event_id for r in rows]
 
         rows, end_token = self._paginate_room_events_txn(
             txn, room_id, after_token, direction='f', limit=after_limit,
+            event_filter=event_filter,
         )
         events_after = [r.event_id for r in rows]
 
diff --git a/tests/handlers/test_typing.py b/tests/handlers/test_typing.py
index b08856f763..2c263af1a3 100644
--- a/tests/handlers/test_typing.py
+++ b/tests/handlers/test_typing.py
@@ -44,7 +44,6 @@ def _expect_edu(destination, edu_type, content, origin="test"):
                 "content": content,
             }
         ],
-        "pdu_failures": [],
     }