# Discovery metrics
metric=discover_dbs:set::SELECT datname FROM pg_database
metric=discover_rep:set::SELECT client_addr || '_' || regexp_replace(application_name, '[ ,]', '_', 'g') AS repid, client_addr, state FROM pg_stat_replication

# Cluster-wide metrics
metric=version:value::SHOW server_version_num
metric=max_frozen_age:value::SELECT max(age(datfrozenxid)) FROM pg_database

# Per-database metrics
metric=db_stats:row::SELECT * FROM pg_stat_database WHERE datname = '{datname}'

# Per-replication metrics
metric=rep_stats:row::SELECT * FROM pg_stat_database WHERE client_addr || '_' || regexp_replace(application_name, '[ ,]', '_', 'g') = '{repid}'