A Prometheus exporter for the poolcounter daemon.

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 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.

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

• 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

• 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

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.