PostgreSQL monitoring & observability

Metric name	Metric key	Description	Unit
Instance uptime	postgres.uptime	Time since the instance has been started	Second

Metric name	Metric key	Description	Unit
Tablespace size	postgres.tablespace.size	Tablespace size in bytes	Byte

Metric name	Metric key	Description	Unit
Instance recovery mode	postgres.recovery.state	Indicate that the instance is in recovery mode. 1 if in recovery, 0 otherwise.	State

Metric name	Metric key	Description	Unit
Active backend processes	postgres.activity.active	Number of server processes executing a query	Count
Idle backend processes	postgres.activity.idle	Number of server processes waiting for a new client command	Count
Idle in transaction backends processes	postgres.activity.idle_in_transaction	Number of server processes in transaction not currently executing a query	Count
Idle in transaction aborted backends processes	postgres.activity.idle_in_transaction_aborted	Number of server processes in transaction not currently executing a query where one of the statements caused an error	Count
Fast-path function backend processes	postgres.activity.fastpath_function_call	Number of server processes executing a fast-path function call	Count

Metric name	Metric key	Description	Unit
WAL diff size	postgres.wal_diff_size	Size of difference between current WAL and last WAL replay	Byte
WAL records per minute	postgres.wal_records.count	Number of WAL records generated per minute	Count
WAL fpi per minute	postgres.wal_fpi.count	Number of WAL full page images generated per minute	Count
WAL bytes	postgres.wal_bytes.count	Total amount of WAL generated in bytes	Count
WAL buffers full	postgres.wal_buffers_full.count	Number of times WAL data was written to disk because WAL buffers became full	Count
WAL write	postgres.wal_write.count	Number of times WAL buffers were written out to disk via XLogWrite request	Count
WAL sync	postgres.wal_sync.count	Number of times WAL files were synced to disk via issue_xlog_fsync request	Count
WAL write time	postgres.wal_write_time.count	Total amount of time spent writing WAL buffers to disk via XLogWrite request, in milliseconds	MilliSecond
WAL sync time	postgres.wal_sync_time.count	Total amount of time spent syncing WAL files to disk via issue_xlog_fsync request, in milliseconds	MilliSecond

Metric name	Metric key	Description	Unit
Replication WAL restart delay	postgres.replication.restart_delay	Difference between current WAL LSN and the restart_lsn as reported by pg_replication_slots	Byte
Replication WAL confirmed flush lag	postgres.replication.confirmed_flush_lag	Difference between current WAL LSN and the confirmed_flush_lsn as reported by pg_replication_slots	Byte
Replication WAL write lag	postgres.replication.write_lag	Time elapsed between flushing recent WAL locally and receiving notification that this standby server has written it, as reported by pg_stat_replication.	Second
Replication WAL flush lag	postgres.replication.flush_lag	Time elapsed between flushing recent WAL locally and receiving notification that this standby server has written and flushed it, as reported by pg_stat_replication.	Second
Replication WAL replay lag	postgres.replication.replay_lag	Time elapsed between flushing recent WAL locally and receiving notification that this standby server has written, flushed and applied it, as reported by pg_stat_replication.	Second

Metric name	Metric key	Description	Unit
Number of locks	postgres.locks	Number of locks as reported by pg_locks	Count

Metric name	Metric key	Description	Unit
Scheduled checkpoints performed	postgres.checkpoints_timed.count	Number of scheduled checkpoints that have been performed	Count
Requested checkpoints performed	postgres.checkpoints_req.count	Number of requested checkpoints that have been performed	Count
Checkpoints write time	postgres.checkpoint_write_time.count	Total amount of time that has been spent in the portion of checkpoint processing where files are written to disk	MilliSecond
Checkpoint sync time	postgres.checkpoint_sync_time.count	Total amount of time that has been spent in the portion of checkpoint processing where files are synchronized to disk	MilliSecond
Buffers written during checkpoints	postgres.buffers_checkpoint.count	Number of buffers written during checkpoints	Count
Buffers written by background writer	postgres.buffers_clean.count	Number of buffers written by the background writer	Count
Cleaning scan stops	postgres.maxwritten_clean.count	Number of times the background writer stopped a cleaning scan because it had written too many buffers	Count
Buffers written by backend	postgres.buffers_backend.count	Number of buffers written directly by a backend	Count
Backend fsync executions	postgres.buffers_backend_fsync.count	Number of times a backend had to execute its own fsync call	Count
Buffers allocated	postgres.buffers_alloc.count	Number of buffers allocated	Count

Metric name	Metric key	Description	Unit
Latest transaction XID age	postgres.xid_age	Difference between the current transaction's XID and datfrozenxid. If this value exceeds 2^31, this can cause a database crash due to transaction ID wraparound.	Count
Number of backends	postgres.numbackends	Number of backends currently connected to this database	Count
Committed transactions	postgres.xact_commit.count	Number of transactions in this database that have been committed	Count
Rolled back transactions	postgres.xact_rollback.count	Number of transactions in this database that have been rolled back	Count
Block read from disk	postgres.blks_read.count	Number of disk blocks read in this database	Count
Blocks found in buffer cache	postgres.blks_hit.count	Number of times disk blocks were found already in the buffer cache, so that a read was not necessary	Count
Live rows returned	postgres.tup_returned.count	Number of live rows fetched by sequential scans and index entries returned by index scans in this database	Count
Live rows fetched by index scans	postgres.tup_fetched.count	Number of live rows fetched by index scans in this database	Count
Rows inserted	postgres.tup_inserted.count	Number of rows inserted by queries in this database	Count
Rows updated	postgres.tup_updated.count	Number of rows updated by queries in this database	Count
Rows deleted	postgres.tup_deleted.count	Number of rows deleted by queries in this database	Count
Queries canceled due to conflict	postgres.conflicts.count	Number of queries canceled due to conflicts with recovery in this database	Count
Temporary files created	postgres.temp_files.count	Number of temporary files created by queries in this database	Count
Data written to temporary files	postgres.temp_bytes.count	Total amount of data written to temporary files by queries in this database	Byte
Deadlocks	postgres.deadlocks.count	Number of deadlocks detected in this database	Count
Data file blocks reading time	postgres.blk_read_time.count	Time spent reading data file blocks by backends in this database	MilliSecond
Data file blocks writing time	postgres.blk_write_time.count	Time spent writing data file blocks by backends in this database	MilliSecond
Database Size	postgres.db_size	Size of the database in bytes	Byte
Data page checksum failures	postgres.checksum_failures.count	Number of data page checksum failures detected in this database. Only available if data checksums are enabled.	Count
Time spent by sessions	postgres.session_time.count	Time spent by database sessions in this database	MilliSecond
Time spent executing SQL statements	postgres.active_time.count	Time spent executing SQL statements in this database	MilliSecond
Time spent idling	postgres.idle_in_transaction_time.count	Time spent idling while in a transaction in this database	MilliSecond
Established sessions	postgres.sessions.count	Total number of sessions established	Count
Abandoned sessions	postgres.sessions_abandoned.count	Number of database sessions to this database that were terminated because connection to the client was lost	Count
Fatal error terminated sessions	postgres.sessions_fatal.count	Number of database sessions to this database that were terminated by fatal errors	Count
Killed sessions	postgres.sessions_killed.count	Number of database sessions to this database that were terminated by operator intervention	Count

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