PoolCounter Prometheus exporter

A Prometheus exporter for the poolcounter daemon.

Building 🛠

After setting up your Go development environment, you can run go build to create an executable. Alternatively you may use the provided Dockerfile to build a container image.

Configuration

Configuration is done via environment variables. All settings are optional and have sane defaults:

• EXPORTER_POOL_COUNTER_ADDRESS - host:port of the poolcounter instance to gather metrics from. Default: localhost:7531.
• EXPORTER_LISTEN_ADDRESS - host:port the collector should listen on. Default: localhost:8000.
• EXPORTER_LOGS_AS_JSON - whether to format stdout logs as JSON or as human readable output. Default: false.
• EXPORTER_COLLECTOR_TIMEOUT_SECONDS - TCP timeout value used by the metrics collector, in seconds. Default: `5.
• EXPORTER_SERVER_TIMEOUT_SECONDS - HTTP timeout values used by the server, in seconds. Default: 3.

Available metrics

Metrics are made available at the /prometheus HTTP endpoint. They correspond to the internal metrics tracked by poolcounter.

Counters

• poolcounter_total_processing_time_seconds - total seconds spent by workers on performing poolcounter-protected tasks
• poolcounter_total_gained_time_seconds - total seconds of processing time saved by the use of PoolCounter in seconds
• poolcounter_total_excl_wait_time_seconds - total seconds spent by workers on waiting on exclusive locks
• poolcounter_total_shared_wait_time_seconds - total seconds spent by workers on waiting on shared locks
• poolcounter_total_acquired - total acquired locks count
• poolcounter_total_releases - total released locks count
• poolcounter_connect_errors - total number of client connection errors
• poolcounter_lock_mismatch - total number of mismatched locks
• poolcounter_release_mismatch - total number of received RELEASE commands for which no lock was found
• poolcounter_processed_count - total number of tasks processed

Gauges

• poolcounter_hashtable_entries - number of entries in poolcounter hash table
• poolcounter_processing_workers - number of workers busy performing poolcounter-protected tasks
• poolcounter_waiting_workers - number of workers waiting in the queue
• poolcounter_full_queues - number of queues that are full of waiting workers

Logging 🌲

Logs are sent to standard output, either in human readable form or as JSON depending on the value of the EXPORTER_LOGS_AS_JSON environment variable.