Use COALESCE to change NULLs to zero-values in ccp_replication_slots query.

Author: dsessler7

internal/collector/eq_pg16_metrics.yaml

@@ -8,10 +8,10 @@
       SELECT
           s.slot_name
           , s.active::int
-          , pg_wal_lsn_diff(CASE WHEN pg_is_in_recovery() THEN pg_last_wal_replay_lsn() ELSE pg_current_wal_insert_lsn() END, s.restart_lsn) AS retained_bytes
-          , s.database
+          , COALESCE(pg_wal_lsn_diff(CASE WHEN pg_is_in_recovery() THEN pg_last_wal_replay_lsn() ELSE pg_current_wal_insert_lsn() END, s.restart_lsn), 0) AS retained_bytes
+          , COALESCE(s.database, '')
           , s.slot_type
-          , s.conflicting::int
+          , COALESCE(s.conflicting::int, 0)
           , 0 AS failover
           , 0 AS synced
       FROM pg_catalog.pg_replication_slots s;