Changing the mysql.innodb.lock_structs metric type to gauge (#17452)

* changed the metric type to gauge

* added changelog for this change

* Update 17452.fixed

Author: aldrickdev

mysql/README.md

@@ -475,7 +475,7 @@ The check does not collect all metrics by default. Set the following boolean con
 | mysql.innodb.ibuf_merges                    | RATE        |
 | mysql.innodb.ibuf_segment_size              | GAUGE       |
 | mysql.innodb.ibuf_size                      | GAUGE       |
-| mysql.innodb.lock_structs                   | RATE        |
+| mysql.innodb.lock_structs                   | GAUGE       |
 | mysql.innodb.locked_tables                  | GAUGE       |
 | mysql.innodb.locked_transactions            | GAUGE       |
 | mysql.innodb.log_waits                      | RATE        |

mysql/changelog.d/17452.fixed

@@ -0,0 +1 @@
+Changing the mysql.innodb.lock_structs metric type to gauge

mysql/datadog_checks/mysql/const.py

@@ -180,7 +180,7 @@
     'Innodb_ibuf_merges': ('mysql.innodb.ibuf_merges', RATE),
     'Innodb_ibuf_segment_size': ('mysql.innodb.ibuf_segment_size', GAUGE),
     'Innodb_ibuf_size': ('mysql.innodb.ibuf_size', GAUGE),
-    'Innodb_lock_structs': ('mysql.innodb.lock_structs', RATE),
+    'Innodb_lock_structs': ('mysql.innodb.lock_structs', GAUGE),
     'Innodb_locked_tables': ('mysql.innodb.locked_tables', GAUGE),
     'Innodb_locked_transactions': ('mysql.innodb.locked_transactions', GAUGE),
     'Innodb_log_waits': ('mysql.innodb.log_waits', RATE),