Adds OTel metrics for Postgres

Issue: PGO-2036

Author: tony-landreth

internal/collector/generated/gte_pg16_metrics.json

@@ -0,0 +1,115 @@
+# This list of queries configures an OTel SQL Query Receiver to read pgMonitor
+# metrics from Postgres.
+#
+# https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/-/receiver/sqlqueryreceiver#metrics-queries
+# https://github.com/CrunchyData/pgmonitor/blob/development/sql_exporter/common/crunchy_global_collector.yml
+
+# TODO: This file is the same as lt_pg16_metris.yaml except for 1 line. Can we DRY this up?
+# NOTE: Some of the columns below can return NULL values, for which sqlqueryreceiver will warn.
+# Those columns are idx_scan and idx_tup_fetch.
+  - sql: >
+      SELECT
+          current_database() as dbname
+          , p.schemaname
+          , p.relname
+          , p.seq_scan
+          , p.seq_tup_read
+          , p.idx_scan
+          , p.idx_tup_fetch
+          , p.n_tup_ins
+          , p.n_tup_upd
+          , p.n_tup_del
+          , p.n_tup_hot_upd
+          , p.n_tup_newpage_upd
+          , p.n_live_tup
+          , p.n_dead_tup
+          , p.vacuum_count
+          , p.autovacuum_count
+          , p.analyze_count
+          , p.autoanalyze_count
+        FROM pg_catalog.pg_stat_user_tables p;
+    metrics:
+      - metric_name: ccp_stat_user_tables_analyze_count 
+        value_column: analyze_count
+        description: Number of times this table has been manually analyzed
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_autoanalyze_count 
+        value_column: autoanalyze_count
+        description: Number of times this table has been analyzed by the autovacuum daemon
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_autovacuum_count 
+        value_column: autovacuum_count
+        description: Number of times this table has been vacuumed by the autovacuum daemon
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_idx_scan 
+        value_column: idx_scan
+        description: Number of index scans initiated on this table
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_idx_tup_fetch 
+        value_column: idx_tup_fetch
+        description: Number of live rows fetched by index scans
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_n_dead_tup 
+        value_column: n_dead_tup
+        description: Estimated number of dead rows
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_n_live_tup 
+        value_column: n_live_tup
+        description: Estimated number of live rows
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_n_tup_del 
+        value_column: n_tup_del
+        description: Number of rows deleted
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_n_tup_hot_upd 
+        value_column: n_tup_hot_upd
+        description: Number of rows HOT updated (i.e., with no separate index update required)
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_n_tup_ins 
+        value_column: n_tup_ins
+        description: Number of rows inserted
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_n_tup_upd 
+        value_column: n_tup_upd
+        description: Number of rows updated
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_seq_scan 
+        value_column: seq_scan
+        description: Number of sequential scans initiated on this table
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_seq_tup_read 
+        value_column: seq_tup_read
+        description: Number of live rows fetched by sequential scans
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"
+      - metric_name: ccp_stat_user_tables_vacuum_count 
+        value_column: vacuum_count
+        description: Number of times this table has been manually vacuumed (not counting VACUUM FULL)
+        attribute_columns: ["dbname", "relname", "schemaname"]
+        static_attributes:
+          server: "localhost:5432"