Switch table rows stats query over to performance_schema (DataDog#20702)

* Switch table rows stats query over to performance_schema

* add changelog

Author: eric-weaver

mysql/changelog.d/20702.fixed

@@ -0,0 +1 @@
+Switch table rows stats query from information_schema to performance_schema

mysql/datadog_checks/mysql/mysql.py

@@ -649,7 +649,7 @@ def _collect_metrics(self, db, tags):
                 results['information_schema_size'] = self._query_size_per_schema(db)
             metrics.update(SCHEMA_VARS)
 
-        if is_affirmative(self._config.options.get('table_rows_stats_metrics', False)) and self.userstat_enabled:
+        if self._config.table_rows_stats_enabled and self.userstat_enabled:
             # report size of tables in MiB to Datadog
             self.log.debug("Collecting Table Row Stats Metrics.")
             with tracked_query(self, operation="table_rows_stats_metrics"):

mysql/datadog_checks/mysql/queries.py

@@ -13,8 +13,13 @@
 LIMIT 1"""
 
 SQL_QUERY_TABLE_ROWS_STATS = """\
-SELECT table_schema, table_name, rows_read, rows_changed
-FROM information_schema.table_statistics"""
+SELECT
+    OBJECT_SCHEMA as table_schema,
+    OBJECT_NAME as table_name,
+    COUNT_READ as rows_read,
+    COUNT_WRITE as rows_changed
+FROM performance_schema.table_io_waits_summary_by_table
+WHERE OBJECT_SCHEMA NOT IN ('mysql', 'performance_schema', 'information_schema')"""
 
 SQL_QUERY_SCHEMA_SIZE = """\
 SELECT table_schema, IFNULL(SUM(data_length+index_length)/1024/1024,0) AS total_mb