PMM-3436 investigate some dashboards for PostgreSQL

queries.yaml

@@ -88,3 +88,65 @@ pg_database:
     - size:
         usage: "GAUGE"
         description: "Disk space used by the database"
+
+pg_stat_statements:
+  query: "SELECT
+             pg_get_userbyid(userid) as user,
+             pg_database.datname,
+             pg_stat_statements.queryid,
+             pg_stat_statements.query,
+             pg_stat_statements.calls,
+             pg_stat_statements.total_time as time_milliseconds,
+             pg_stat_statements.rows,
+             pg_stat_statements.shared_blks_hit,
+             pg_stat_statements.shared_blks_read,
+             pg_stat_statements.shared_blks_dirtied,
+             pg_stat_statements.shared_blks_written,
+             pg_stat_statements.local_blks_hit,
+             pg_stat_statements.local_blks_read,
+             pg_stat_statements.local_blks_dirtied,
+             pg_stat_statements.local_blks_written,
+             pg_stat_statements.temp_blks_read,
+             pg_stat_statements.temp_blks_written,
+             pg_stat_statements.blk_read_time,
+             pg_stat_statements.blk_write_time
+          FROM pg_stat_statements
+          JOIN pg_database
+          ON pg_database.oid = pg_stat_statements.dbid"
+  metrics:
+    - user:
+        usage: "LABEL"
+        description: "The user who executed the statement"
+    - datname:
+        usage: "LABEL"
+        description: "The database in which the statement was executed"
+    - queryid:
+        usage: "LABEL"
+        description: "Internal hash code, computed from the statement's parse tree"
+    - query:
+        usage: "LABEL"
+        description: "Processed query"
+    - calls:
+        usage: "COUNTER"
+        description: "Number of times executed"
+    - time_milliseconds:
+        usage: "COUNTER"
+        description: "Total time spent in the statement, in milliseconds"
+    - rows:
+        usage: "COUNTER"
+        description: "Total number of rows retrieved or affected by the statement"
+    - shared_blks_hit:
+        usage: "COUNTER"
+        description: "Total number of shared block cache hits by the statement"
+    - shared_blks_read:
+        usage: "COUNTER"
+        description: "Total number of shared blocks read by the statement"
+    - shared_blks_dirtied:
+        usage: "COUNTER"
+        description: "Total number of shared blocks dirtied by the statement"
+    - shared_blks_written:
+        usage: "COUNTER"
+        description: "Total number of shared blocks written by the statement"
+    - local_blks_hit:
+        usage: "COUNTER"
+        description: "Total number of local block cache hits by the statement"