database_observability: add database exclude list for Postgres (#4819)

Author: fridgepoet

CHANGELOG.md

@@ -48,6 +48,7 @@ v1.12.0-rc.0
   - enable `explain_plans` collector by default (@rgeyer)
   - safely generate server_id when UDP socket used for database connection (@matthewnolf)
   - add table registry and include "validated" in parsed table name logs (@fridgepoet)
+  - add database exclusion list for Postgres schema_details collector (@fridgepoet)
 
 - Add `otelcol.exporter.googlecloudpubsub` community component to export metrics, traces, and logs to Google Cloud Pub/Sub topic. (@eraac)
 

internal/component/database_observability/postgres/collector/schema_details.go

@@ -29,12 +29,15 @@ const (
 )
 
 const (
+	excludedDatabases = `('azure_maintenance')`
+
 	// selectAllDatabases makes use of the initial DB connection to discover other databases on the same Postgres instance
 	selectAllDatabases = `
-		SELECT datname 
-		FROM pg_database 
+		SELECT datname
+		FROM pg_database
 		WHERE datistemplate = false
-			AND has_database_privilege(datname, 'CONNECT')`
+			AND has_database_privilege(datname, 'CONNECT')
+			AND datname NOT IN ` + excludedDatabases
 
 	// selectSchemaNames gets all user-defined schemas, excluding system schemas
 	selectSchemaNames = `

internal/component/database_observability/postgres/collector/schema_details_test.go

@@ -1706,3 +1706,12 @@ func Test_SchemaDetails_populates_TableRegistry(t *testing.T) {
 		}, actual)
 	})
 }
+
+func Test_Postgres_SchemaDetails_query_excludes_databases(t *testing.T) {
+	assert.Equal(t, `
+		SELECT datname
+		FROM pg_database
+		WHERE datistemplate = false
+			AND has_database_privilege(datname, 'CONNECT')
+			AND datname NOT IN ('azure_maintenance')`, selectAllDatabases)
+}