296 lines
18 KiB
Markdown
296 lines
18 KiB
Markdown
# How to monitor Synapse metrics using Prometheus
|
|
|
|
1. Install Prometheus:
|
|
|
|
Follow instructions at
|
|
<http://prometheus.io/docs/introduction/install/>
|
|
|
|
1. Enable Synapse metrics:
|
|
|
|
In `homeserver.yaml`, make sure `enable_metrics` is
|
|
set to `True`.
|
|
|
|
1. Enable the `/_synapse/metrics` Synapse endpoint that Prometheus uses to
|
|
collect data:
|
|
|
|
There are two methods of enabling the metrics endpoint 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:
|
|
|
|
```yaml
|
|
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 `/_synapse/metrics`.
|
|
|
|
Add a new listener to homeserver.yaml:
|
|
|
|
```yaml
|
|
listeners:
|
|
- type: metrics
|
|
port: 9000
|
|
bind_addresses:
|
|
- '0.0.0.0'
|
|
```
|
|
|
|
1. Restart Synapse.
|
|
|
|
1. Add a Prometheus target for Synapse.
|
|
|
|
It needs to set the `metrics_path` to a non-default value (under
|
|
`scrape_configs`):
|
|
|
|
```yaml
|
|
- job_name: "synapse"
|
|
scrape_interval: 15s
|
|
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`.
|
|
|
|
1. Restart Prometheus.
|
|
|
|
1. Consider using the [grafana dashboard](https://github.com/matrix-org/synapse/tree/master/contrib/grafana/)
|
|
and required [recording rules](https://github.com/matrix-org/synapse/tree/master/contrib/prometheus/)
|
|
|
|
## Monitoring workers
|
|
|
|
To monitor a Synapse installation using [workers](workers.md),
|
|
every worker needs to be monitored independently, in addition to
|
|
the main homeserver process. This is because workers don't send
|
|
their metrics to the main homeserver process, but expose them
|
|
directly (if they are configured to do so).
|
|
|
|
To allow collecting metrics from a worker, you need to add a
|
|
`metrics` listener to its configuration, by adding the following
|
|
under `worker_listeners`:
|
|
|
|
```yaml
|
|
- type: metrics
|
|
bind_address: ''
|
|
port: 9101
|
|
```
|
|
|
|
The `bind_address` and `port` parameters should be set so that
|
|
the resulting listener can be reached by prometheus, and they
|
|
don't clash with an existing worker.
|
|
With this example, the worker's metrics would then be available
|
|
on `http://127.0.0.1:9101`.
|
|
|
|
Example Prometheus target for Synapse with workers:
|
|
|
|
```yaml
|
|
- job_name: "synapse"
|
|
scrape_interval: 15s
|
|
metrics_path: "/_synapse/metrics"
|
|
static_configs:
|
|
- targets: ["my.server.here:port"]
|
|
labels:
|
|
instance: "my.server"
|
|
job: "master"
|
|
index: 1
|
|
- targets: ["my.workerserver.here:port"]
|
|
labels:
|
|
instance: "my.server"
|
|
job: "generic_worker"
|
|
index: 1
|
|
- targets: ["my.workerserver.here:port"]
|
|
labels:
|
|
instance: "my.server"
|
|
job: "generic_worker"
|
|
index: 2
|
|
- targets: ["my.workerserver.here:port"]
|
|
labels:
|
|
instance: "my.server"
|
|
job: "media_repository"
|
|
index: 1
|
|
```
|
|
|
|
Labels (`instance`, `job`, `index`) can be defined as anything.
|
|
The labels are used to group graphs in grafana.
|
|
|
|
## 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.
|
|
**The old names will be disabled by default in Synapse v1.71.0 and removed
|
|
altogether in Synapse v1.73.0.**
|
|
|
|
| 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_caches_cache_hits | synapse_util_caches_cache:hits |
|
|
| synapse_util_caches_cache_size | synapse_util_caches_cache:size |
|
|
| synapse_util_caches_cache_evicted_size | synapse_util_caches_cache:evicted_size |
|
|
| synapse_util_caches_cache | synapse_util_caches_cache:total |
|
|
| synapse_util_caches_response_cache_size | synapse_util_caches_response_cache:size |
|
|
| synapse_util_caches_response_cache_hits | synapse_util_caches_response_cache:hits |
|
|
| synapse_util_caches_response_cache_evicted_size | synapse_util_caches_response_cache:evicted_size |
|
|
| 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 milliseconds.
|
|
|
|
| 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 |
|