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-rw-r--r--docs/upgrade.md22
-rw-r--r--docs/usage/configuration/config_documentation.md25
2 files changed, 22 insertions, 25 deletions
diff --git a/docs/upgrade.md b/docs/upgrade.md
index 2aa353e496..4fe9e4f02e 100644
--- a/docs/upgrade.md
+++ b/docs/upgrade.md
@@ -88,6 +88,28 @@ process, for example:
     dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
     ```
 
+# Upgrading to v1.73.0
+
+## Legacy Prometheus metric names have now been removed
+
+Synapse v1.69.0 included the deprecation of legacy Prometheus metric names
+and offered an option to disable them.
+Synapse v1.71.0 disabled legacy Prometheus metric names by default.
+
+This version, v1.73.0, removes those legacy Prometheus metric names entirely.
+This also means that the `enable_legacy_metrics` configuration option has been
+removed; it will no longer be possible to re-enable the legacy metric names.
+
+If you use metrics and have not yet updated your Grafana dashboard(s),
+Prometheus console(s) or alerting rule(s), please consider doing so when upgrading
+to this version.
+Note that the included Grafana dashboard was updated in v1.72.0 to correct some
+metric names which were missed when legacy metrics were disabled by default.
+
+See [v1.69.0: Deprecation of legacy Prometheus metric names](#deprecation-of-legacy-prometheus-metric-names)
+for more context.
+
+
 # Upgrading to v1.72.0
 
 ## Dropping support for PostgreSQL 10
diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md
index f5937dd902..fae2771fad 100644
--- a/docs/usage/configuration/config_documentation.md
+++ b/docs/usage/configuration/config_documentation.md
@@ -2437,31 +2437,6 @@ Example configuration:
 enable_metrics: true
 ```
 ---
-### `enable_legacy_metrics`
-
-Set to `true` to publish both legacy and non-legacy Prometheus metric names,
-or to `false` to only publish non-legacy Prometheus metric names.
-Defaults to `false`. Has no effect if `enable_metrics` is `false`.
-**In Synapse v1.67.0 up to and including Synapse v1.70.1, this defaulted to `true`.**
-
-Legacy metric names include:
-- metrics containing colons in the name, such as `synapse_util_caches_response_cache:hits`, because colons are supposed to be reserved for user-defined recording rules;
-- counters that don't end with the `_total` suffix, such as `synapse_federation_client_sent_edus`, therefore not adhering to the OpenMetrics standard.
-
-These legacy metric names are unconventional and not compliant with OpenMetrics standards.
-They are included for backwards compatibility.
-
-Example configuration:
-```yaml
-enable_legacy_metrics: false
-```
-
-See https://github.com/matrix-org/synapse/issues/11106 for context.
-
-*Since v1.67.0.*
-
-**Will be removed in v1.73.0.**
----
 ### `sentry`
 
 Use this option to enable sentry integration. Provide the DSN assigned to you by sentry