james/pgmon
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases 3 Wiki Activity

Add initial bgwriter and activity metrics queries

Browse Source
This commit is contained in:
James Campbell 2025-06-17 02:23:45 -04:00
parent 9225e745b0
commit 4fba81dc2c
Signed by: james
GPG Key ID: 2287C33A40DC906A
1 changed files with 37 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
sample-config/pgmon-metrics.yml
View File

@ -1,5 +1,7 @@
metrics:
##
# Discovery metrics
##
discover_dbs:
type: set
query:
@ -14,7 +16,9 @@ metrics:
90400: SELECT slot_name, plugin, slot_type, database, false as temporary, active FROM pg_replication_slots
100000: SELECT slot_name, plugin, slot_type, database, temporary, active FROM pg_replication_slots
##
# cluster-wide metrics
##
version:
type: value
query:
@ -26,12 +30,20 @@ metrics:
0: SELECT max(age(datfrozenxid)) AS xid_age, 0 AS mxid_age FROM pg_database
90600: SELECT max(age(datfrozenxid)) AS xid_age, max(mxid_age(datminmxid)) AS mxid_age FROM pg_database
bgwriter:
type: row
query:
0: SELECT checkpoints_timed, checkpoints_req, checkpoint_write_time, checkpoint_sync_time, buffers_checkpoint, buffers_clean, maxwritten_clean, buffers_backend, buffers_backend_fsync, buffers_alloc FROM pg_stat_bgwriter;
##
# Per-database metrics
##
db_stats:
type: row
query:
0: SELECT numbackends, xact_commit, xact_rollback, blks_read, blks_hit, tup_returned, tup_fetched, tup_inserted, tup_updated, tup_deleted, conflicts, temp_files, temp_bytes, deadlocks, blk_read_time, blk_write_time, extract('epoch' from stats_reset)::float FROM pg_stat_database WHERE datname = %(dbname)s
140000: SELECT numbackends, xact_commit, xact_rollback, blks_read, blks_hit, tup_returned, tup_fetched, tup_inserted, tup_updated, tup_deleted, conflicts, temp_files, temp_bytes, deadlocks, COALESCE(checksum_failures, 0) AS checksum_failures, blk_read_time, blk_write_time, session_time, active_time, idle_in_transaction_time, sessions, sessions_abandoned, sessions_fatal, sessions_killed, extract('epoch' from stats_reset)::float FROM pg_stat_database WHERE datname = %(dbname)s
0: SELECT numbackends, xact_commit, xact_rollback, blks_read, blks_hit, tup_returned, tup_fetched, tup_inserted, tup_updated, tup_deleted, conflicts, temp_files, temp_bytes, deadlocks, 0 AS checksum_failures, blk_read_time, blk_write_time, 0 AS session_time, 0 AS active_time, 0 AS idle_in_transaction_time, 0 AS sessions, 0 AS sessions_abandoned, 0 AS sessions_fatal, 0 AS sessions_killed, extract('epoch' from stats_reset)::float AS stats_reset FROM pg_stat_database WHERE datname = %(dbname)s
140000: SELECT numbackends, xact_commit, xact_rollback, blks_read, blks_hit, tup_returned, tup_fetched, tup_inserted, tup_updated, tup_deleted, conflicts, temp_files, temp_bytes, deadlocks, COALESCE(checksum_failures, 0) AS checksum_failures, blk_read_time, blk_write_time, session_time, active_time, idle_in_transaction_time, sessions, sessions_abandoned, sessions_fatal, sessions_killed, extract('epoch' from stats_reset)::float AS stats_reset FROM pg_stat_database WHERE datname = %(dbname)s
test_args:
dbname: postgres
@ -40,13 +52,21 @@ metrics:
query:
0: SELECT sum(heap_blks_read)::float / NULLIF(sum(heap_blks_read + heap_blks_hit), 0) AS avg_heap_hit_ratio, sum(idx_blks_hit)::float / NULLIF(sum(idx_blks_read + idx_blks_hit), 0) AS avg_idx_hit_ratio, sum(toast_blks_hit)::float / NULLIF(sum(toast_blks_read + toast_blks_hit), 0) AS avg_toast_hit_ratio, sum(tidx_blks_hit)::float / NULLIF(sum(tidx_blks_read + tidx_blks_hit), 0) AS avg_tidx_hit_ratio FROM pg_statio_all_tables
# Debugging
ntables:
type: value
activity:
type: row
query:
0: SELECT count(*) AS ntables FROM pg_stat_user_tables
0: >
SELECT count(*) as backend_count,
count(*) FILTER (WHERE state = 'idle') AS idle_count,
count(*) FILTER (WHERE state = 'idle in transaction') AS idle_tx_count,
COALESCE(EXTRACT(EPOCH FROM max(now() - state_change) FILTER (WHERE state = 'active'))::float, 0) AS max_active_time,
COALESCE(EXTRACT(EPOCH FROM max(now() - state_change) FILTER (WHERE state = 'idle in transaction'))::float, 0) AS max_idle_tx_time
FROM pg_stat_activity
WHERE datname = %(dbname)s
##
# Per-replication metrics
##
rep_stats:
type: row
query:
@ -54,7 +74,10 @@ metrics:
test_args:
repid: 127.0.0.1_test_rep
##
# Per-slot metrics
##
slot_stats:
type: row
query:
@ -62,3 +85,11 @@ metrics:
100000: SELECT active_pid, xmin, pg_wal_lsn_diff(pg_current_wal_lsn(), restart_lsn) AS restart_bytes, pg_wal_lsn_diff(pg_current_wal_lsn(), confirmed_flush_lsn) AS confirmed_flush_bytes FROM pg_replication_slots WHERE slot_name = %(slot)s
test_args:
slot: test_slot
##
# Debugging
##
ntables:
type: value
query:
0: SELECT count(*) AS ntables FROM pg_stat_user_tables