Prometheus Metrics

You can configure metrics support by adding the following to your config:

metrics:
  enabled: true
  bindAddress: 127.0.0.1
  port: 9002

An example dashboard that can be used with Grafana can be found at /contrib/hookshot-dashboard.json. There are 3 variables at the top of the dashboard:

Select the Prometheus with your Hookshot metrics as Data Source. Set Interval to your scraping interval. Set 2x Interval to twice the Interval value (why?).

Below is the generated list of Prometheus metrics for Hookshot.

hookshot

Metric	Help	Labels
hookshot_webhooks_http_request	Number of requests made to the hookshot webhooks handler	path, method
hookshot_provisioning_http_request	Number of requests made to the hookshot webhooks handler	path, method
hookshot_queue_event_pushes	Number of events pushed through the queue	event
hookshot_connection_event_failed	The number of events that failed to process	event, connectionId
hookshot_connections	The number of active hookshot connections	service
hookshot_notifications_push	Number of notifications pushed	service
hookshot_notifications_service_up	Is the notification service up or down	service
hookshot_notifications_watchers	Number of notifications watchers running	service

matrix

Metric	Help	Labels
matrix_api_calls	The number of Matrix client API calls made	method
matrix_api_calls_failed	The number of Matrix client API calls which failed	method
matrix_appservice_events	The number of events sent over the AS API

feed

Metric	Help	Labels
feed_count	The number of RSS feeds that hookshot is subscribed to
feed_fetch_ms	The time taken for hookshot to fetch all feeds

process

Metric	Help	Labels
process_cpu_user_seconds_total	Total user CPU time spent in seconds.
process_cpu_system_seconds_total	Total system CPU time spent in seconds.
process_cpu_seconds_total	Total user and system CPU time spent in seconds.
process_start_time_seconds	Start time of the process since unix epoch in seconds.
process_resident_memory_bytes	Resident memory size in bytes.
process_virtual_memory_bytes	Virtual memory size in bytes.
process_heap_bytes	Process heap size in bytes.
process_open_fds	Number of open file descriptors.
process_max_fds	Maximum number of open file descriptors.

nodejs

Metric	Help	Labels
nodejs_eventloop_lag_seconds	Lag of event loop in seconds.
nodejs_eventloop_lag_min_seconds	The minimum recorded event loop delay.
nodejs_eventloop_lag_max_seconds	The maximum recorded event loop delay.
nodejs_eventloop_lag_mean_seconds	The mean of the recorded event loop delays.
nodejs_eventloop_lag_stddev_seconds	The standard deviation of the recorded event loop delays.
nodejs_eventloop_lag_p50_seconds	The 50th percentile of the recorded event loop delays.
nodejs_eventloop_lag_p90_seconds	The 90th percentile of the recorded event loop delays.
nodejs_eventloop_lag_p99_seconds	The 99th percentile of the recorded event loop delays.
nodejs_active_handles	Number of active libuv handles grouped by handle type. Every handle type is C++ class name.	type
nodejs_active_handles_total	Total number of active handles.
nodejs_active_requests	Number of active libuv requests grouped by request type. Every request type is C++ class name.	type
nodejs_active_requests_total	Total number of active requests.
nodejs_heap_size_total_bytes	Process heap size from Node.js in bytes.
nodejs_heap_size_used_bytes	Process heap size used from Node.js in bytes.
nodejs_external_memory_bytes	Node.js external memory size in bytes.
nodejs_heap_space_size_total_bytes	Process heap space size total from Node.js in bytes.	space
nodejs_heap_space_size_used_bytes	Process heap space size used from Node.js in bytes.	space
nodejs_heap_space_size_available_bytes	Process heap space size available from Node.js in bytes.	space
nodejs_version_info	Node.js version info.	version, major, minor, patch
nodejs_gc_duration_seconds	Garbage collection duration by kind, one of major, minor, incremental or weakcb.	kind