frostfs-node/docs/ir-metrics.md

FrostFS Node prometheus metrics

Name	Description	Constant labels	Variable labels
frostfs_ir_ir_epoch	Current epoch as seen by inner-ring node.
frostfs_ir_ir_event_duration_seconds	Duration of processing of inner-ring events		type success
frostfs_ir_ir_health	Current inner-ring node state.
frostfs_ir_logger_entry_count	Total log entries emitted or dropped by severity level		level dropped
frostfs_ir_morphcache_request_duration_seconds	Morph cache request process duration		success method