update the metric docs to reflect periodicity of LocksExpired and PresenceExpired
@@ -76,8 +76,8 @@ A list of component-level metrics emitted by Diego. Contributors interested in a
| `DBQueriesTotal` | Cumulative number of SQL queries executed, including `BEGIN`, `COMMIT`, and `ROLLBACK` statements. | number |
| `DBQueriesSucceeded` | Cumulative number of SQL queries that finished successfully. | number |
| `DBQueryDurationMax` | Maximum duration of all queries that have run in the last 60 seconds. Emitted every 60 seconds. | ns |
-| `LocksExpired` | Cumulative number of locks that have expired. Emitted when a lock is expired. | number |
-| `PresenceExpired` | Cumulative number of presences that have expired. Emitted when a presence is expired. | number |
+| `LocksExpired` | Cumulative number of locks that have expired. Emitted every 60 seconds. | number |
+| `PresenceExpired` | Cumulative number of presences that have expired. Emitted every 60 seconds. | number |
| `RequestsStarted` | Cumulative number of requests of a particular type that have been made. Currently tracking `Lock`, `Release`, `Fetch`, and `FetchAll` requests. Emitted every 60 seconds. | number |
| `RequestsSucceeded` | Cumulative number of requests of a particular type that have completed successfully. Currently tracking `Lock`, `Release`, `Fetch`, and `FetchAll` requests. Emitted every 60 seconds. | number |
| `RequestsFailed` | Cumulative number of requests of a particular type that have failed for any reason. Currently tracking `Lock`, `Release`, `Fetch`, and `FetchAll` requests. Emitted every 60 seconds. | number |
