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How to monitor Synapse metrics using Prometheus

Install Prometheus:

Follow instructions at http://prometheus.io/docs/introduction/install/
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.
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.

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

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

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