(#5849) Convert rst to markdown (#6040)

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-How to monitor Synapse metrics using Prometheus
-===============================================
-
-1. Install Prometheus:
-
-   Follow instructions at http://prometheus.io/docs/introduction/install/
-
-2. Enable Synapse metrics:
-
-   There are two methods of enabling metrics in Synapse.
-
-   The first serves the metrics as a part of the usual web server and can be
-   enabled by adding the "metrics" resource to the existing listener as such::
-
-     resources:
-       - names:
-         - client
-         - metrics
-
-   This provides a simple way of adding metrics to your Synapse installation,
-   and serves under ``/_synapse/metrics``. If you do not wish your metrics be
-   publicly exposed, you will need to either filter it out at your load
-   balancer, or use the second method.
-
-   The second method runs the metrics server on a different port, in a
-   different thread to Synapse. This can make it more resilient to heavy load
-   meaning metrics cannot be retrieved, and can be exposed to just internal
-   networks easier. The served metrics are available over HTTP only, and will
-   be available at ``/``.
-
-   Add a new listener to homeserver.yaml::
-
-     listeners:
-       - type: metrics
-         port: 9000
-         bind_addresses:
-           - '0.0.0.0'
-
-   For both options, you will need to ensure that ``enable_metrics`` is set to
-   ``True``.
-
-   Restart Synapse.
-
-3. Add a Prometheus target for Synapse.
-
-   It needs to set the ``metrics_path`` to a non-default value (under ``scrape_configs``)::
-
-    - job_name: "synapse"
-      metrics_path: "/_synapse/metrics"
-      static_configs:
-        - targets: ["my.server.here:port"]
-
-   where ``my.server.here`` is the IP address of Synapse, and ``port`` is the listener port
-   configured with the ``metrics`` resource.
-
-   If your prometheus is older than 1.5.2, you will need to replace
-   ``static_configs`` in the above with ``target_groups``.
-
-   Restart Prometheus.
-
-
-Renaming of metrics & deprecation of old names in 1.2
------------------------------------------------------
-
-Synapse 1.2 updates the Prometheus metrics to match the naming convention of the
-upstream ``prometheus_client``. The old names are considered deprecated and will
-be removed in a future version of Synapse.
-
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-|                                  New Name                                   |                               Old Name                                |
-+=============================================================================+=======================================================================+
-| python_gc_objects_collected_total                                           | python_gc_objects_collected                                           |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| python_gc_objects_uncollectable_total                                       | python_gc_objects_uncollectable                                       |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| python_gc_collections_total                                                 | python_gc_collections                                                 |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| process_cpu_seconds_total                                                   | process_cpu_seconds                                                   |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_federation_client_sent_transactions_total                           | synapse_federation_client_sent_transactions                           |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_federation_client_events_processed_total                            | synapse_federation_client_events_processed                            |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_event_processing_loop_count_total                                   | synapse_event_processing_loop_count                                   |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_event_processing_loop_room_count_total                              | synapse_event_processing_loop_room_count                              |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_util_metrics_block_count_total                                      | synapse_util_metrics_block_count                                      |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_util_metrics_block_time_seconds_total                               | synapse_util_metrics_block_time_seconds                               |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_util_metrics_block_ru_utime_seconds_total                           | synapse_util_metrics_block_ru_utime_seconds                           |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_util_metrics_block_ru_stime_seconds_total                           | synapse_util_metrics_block_ru_stime_seconds                           |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_util_metrics_block_db_txn_count_total                               | synapse_util_metrics_block_db_txn_count                               |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_util_metrics_block_db_txn_duration_seconds_total                    | synapse_util_metrics_block_db_txn_duration_seconds                    |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_util_metrics_block_db_sched_duration_seconds_total                  | synapse_util_metrics_block_db_sched_duration_seconds                  |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_background_process_start_count_total                                | synapse_background_process_start_count                                |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_background_process_ru_utime_seconds_total                           | synapse_background_process_ru_utime_seconds                           |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_background_process_ru_stime_seconds_total                           | synapse_background_process_ru_stime_seconds                           |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_background_process_db_txn_count_total                               | synapse_background_process_db_txn_count                               |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_background_process_db_txn_duration_seconds_total                    | synapse_background_process_db_txn_duration_seconds                    |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_background_process_db_sched_duration_seconds_total                  | synapse_background_process_db_sched_duration_seconds                  |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_storage_events_persisted_events_total                               | synapse_storage_events_persisted_events                               |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_storage_events_persisted_events_sep_total                           | synapse_storage_events_persisted_events_sep                           |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_storage_events_state_delta_total                                    | synapse_storage_events_state_delta                                    |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_storage_events_state_delta_single_event_total                       | synapse_storage_events_state_delta_single_event                       |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_storage_events_state_delta_reuse_delta_total                        | synapse_storage_events_state_delta_reuse_delta                        |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_federation_server_received_pdus_total                               | synapse_federation_server_received_pdus                               |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_federation_server_received_edus_total                               | synapse_federation_server_received_edus                               |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_handler_presence_notified_presence_total                            | synapse_handler_presence_notified_presence                            |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_handler_presence_federation_presence_out_total                      | synapse_handler_presence_federation_presence_out                      |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_handler_presence_presence_updates_total                             | synapse_handler_presence_presence_updates                             |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_handler_presence_timers_fired_total                                 | synapse_handler_presence_timers_fired                                 |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_handler_presence_federation_presence_total                          | synapse_handler_presence_federation_presence                          |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_handler_presence_bump_active_time_total                             | synapse_handler_presence_bump_active_time                             |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_federation_client_sent_edus_total                                   | synapse_federation_client_sent_edus                                   |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_federation_client_sent_pdu_destinations_count_total                 | synapse_federation_client_sent_pdu_destinations:count                 |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_federation_client_sent_pdu_destinations_total                       | synapse_federation_client_sent_pdu_destinations:total                 |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_handlers_appservice_events_processed_total                          | synapse_handlers_appservice_events_processed                          |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_notifier_notified_events_total                                      | synapse_notifier_notified_events                                      |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_push_bulk_push_rule_evaluator_push_rules_invalidation_counter_total | synapse_push_bulk_push_rule_evaluator_push_rules_invalidation_counter |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_push_bulk_push_rule_evaluator_push_rules_state_size_counter_total   | synapse_push_bulk_push_rule_evaluator_push_rules_state_size_counter   |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_http_httppusher_http_pushes_processed_total                         | synapse_http_httppusher_http_pushes_processed                         |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_http_httppusher_http_pushes_failed_total                            | synapse_http_httppusher_http_pushes_failed                            |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_http_httppusher_badge_updates_processed_total                       | synapse_http_httppusher_badge_updates_processed                       |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-| synapse_http_httppusher_badge_updates_failed_total                          | synapse_http_httppusher_badge_updates_failed                          |
-+-----------------------------------------------------------------------------+-----------------------------------------------------------------------+
-
-
-Removal of deprecated metrics & time based counters becoming histograms in 0.31.0
----------------------------------------------------------------------------------
-
-The duplicated metrics deprecated in Synapse 0.27.0 have been removed.
-
-All time duration-based metrics have been changed to be seconds. This affects:
-
-+----------------------------------+
-| msec -> sec metrics              |
-+==================================+
-| python_gc_time                   |
-+----------------------------------+
-| python_twisted_reactor_tick_time |
-+----------------------------------+
-| synapse_storage_query_time       |
-+----------------------------------+
-| synapse_storage_schedule_time    |
-+----------------------------------+
-| synapse_storage_transaction_time |
-+----------------------------------+
-
-Several metrics have been changed to be histograms, which sort entries into
-buckets and allow better analysis. The following metrics are now histograms:
-
-+-------------------------------------------+
-| Altered metrics                           |
-+===========================================+
-| python_gc_time                            |
-+-------------------------------------------+
-| python_twisted_reactor_pending_calls      |
-+-------------------------------------------+
-| python_twisted_reactor_tick_time          |
-+-------------------------------------------+
-| synapse_http_server_response_time_seconds |
-+-------------------------------------------+
-| synapse_storage_query_time                |
-+-------------------------------------------+
-| synapse_storage_schedule_time             |
-+-------------------------------------------+
-| synapse_storage_transaction_time          |
-+-------------------------------------------+
-
-
-Block and response metrics renamed for 0.27.0
----------------------------------------------
-
-Synapse 0.27.0 begins the process of rationalising the duplicate ``*:count``
-metrics reported for the resource tracking for code blocks and HTTP requests.
-
-At the same time, the corresponding ``*:total`` metrics are being renamed, as
-the ``:total`` suffix no longer makes sense in the absence of a corresponding
-``:count`` metric.
-
-To enable a graceful migration path, this release just adds new names for the
-metrics being renamed. A future release will remove the old ones.
-
-The following table shows the new metrics, and the old metrics which they are
-replacing.
-
-==================================================== ===================================================
-New name                                             Old name
-==================================================== ===================================================
-synapse_util_metrics_block_count                     synapse_util_metrics_block_timer:count
-synapse_util_metrics_block_count                     synapse_util_metrics_block_ru_utime:count
-synapse_util_metrics_block_count                     synapse_util_metrics_block_ru_stime:count
-synapse_util_metrics_block_count                     synapse_util_metrics_block_db_txn_count:count
-synapse_util_metrics_block_count                     synapse_util_metrics_block_db_txn_duration:count
-
-synapse_util_metrics_block_time_seconds              synapse_util_metrics_block_timer:total
-synapse_util_metrics_block_ru_utime_seconds          synapse_util_metrics_block_ru_utime:total
-synapse_util_metrics_block_ru_stime_seconds          synapse_util_metrics_block_ru_stime:total
-synapse_util_metrics_block_db_txn_count              synapse_util_metrics_block_db_txn_count:total
-synapse_util_metrics_block_db_txn_duration_seconds   synapse_util_metrics_block_db_txn_duration:total
-
-synapse_http_server_response_count                   synapse_http_server_requests
-synapse_http_server_response_count                   synapse_http_server_response_time:count
-synapse_http_server_response_count                   synapse_http_server_response_ru_utime:count
-synapse_http_server_response_count                   synapse_http_server_response_ru_stime:count
-synapse_http_server_response_count                   synapse_http_server_response_db_txn_count:count
-synapse_http_server_response_count                   synapse_http_server_response_db_txn_duration:count
-
-synapse_http_server_response_time_seconds            synapse_http_server_response_time:total
-synapse_http_server_response_ru_utime_seconds        synapse_http_server_response_ru_utime:total
-synapse_http_server_response_ru_stime_seconds        synapse_http_server_response_ru_stime:total
-synapse_http_server_response_db_txn_count            synapse_http_server_response_db_txn_count:total
-synapse_http_server_response_db_txn_duration_seconds synapse_http_server_response_db_txn_duration:total
-==================================================== ===================================================
-
-
-Standard Metric Names
----------------------
-
-As of synapse version 0.18.2, the format of the process-wide metrics has been
-changed to fit prometheus standard naming conventions. Additionally the units
-have been changed to seconds, from miliseconds.
-
-================================== =============================
-New name                           Old name
-================================== =============================
-process_cpu_user_seconds_total     process_resource_utime / 1000
-process_cpu_system_seconds_total   process_resource_stime / 1000
-process_open_fds (no 'type' label) process_fds
-================================== =============================
-
-The python-specific counts of garbage collector performance have been renamed.
-
-=========================== ======================
-New name                    Old name
-=========================== ======================
-python_gc_time              reactor_gc_time
-python_gc_unreachable_total reactor_gc_unreachable
-python_gc_counts            reactor_gc_counts
-=========================== ======================
-
-The twisted-specific reactor metrics have been renamed.
-
-==================================== =====================
-New name                             Old name
-==================================== =====================
-python_twisted_reactor_pending_calls reactor_pending_calls
-python_twisted_reactor_tick_time     reactor_tick_time
-==================================== =====================