Update docs to clarify worker/* metrics for Middle Managers and Indexers

Update the descriptions of worker/* metrics to better distinguish between
Middle Managers and Indexers, as the dimensions differ. The updated text should make this
distinction clearer.

Author: abhishekrb19

docs/operations/metrics.md

@@ -319,16 +319,16 @@ If the JVM does not support CPU time measurement for the current thread, `ingest
 |`taskSlot/used/count`|Number of busy task slots per emission period. This metric is only available if the `TaskSlotCountStatsMonitor` module is included.| `category`|Varies|
 |`taskSlot/lazy/count`|Number of total task slots in lazy marked Middle Managers and Indexers per emission period. This metric is only available if the `TaskSlotCountStatsMonitor` module is included.| `category`|Varies|
 |`taskSlot/blacklisted/count`|Number of total task slots in blacklisted Middle Managers and Indexers per emission period. This metric is only available if the `TaskSlotCountStatsMonitor` module is included.| `category`|Varies|
-|`worker/task/failed/count`|Number of failed tasks run on the reporting worker per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included, and is only supported for Middle Manager nodes.| `category`, `workerVersion`|Varies|
-|`worker/task/success/count`|Number of successful tasks run on the reporting worker per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included, and is only supported for Middle Manager nodes.| `category`,`workerVersion`|Varies|
-|`worker/taskSlot/idle/count`|Number of idle task slots on the reporting worker per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included, and is only supported for Middle Manager nodes.| `category`, `workerVersion`|Varies|
-|`worker/taskSlot/total/count`|Number of total task slots on the reporting worker per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.| `category`, `workerVersion`|Varies|
-|`worker/taskSlot/used/count`|Number of busy task slots on the reporting worker per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.| `category`, `workerVersion`|Varies|
+|`worker/task/failed/count`|Number of failed tasks run on the reporting Middle Manager worker per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.| `category`, `workerVersion`|Varies|
+|`worker/task/success/count`|Number of successful tasks run on the reporting Middle Manager worker per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.| `category`,`workerVersion`|Varies|
+|`worker/taskSlot/idle/count`|Number of idle task slots on the reporting Middle Manager worker per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.| `category`, `workerVersion`|Varies|
+|`worker/taskSlot/total/count`|Number of total task slots on the reporting Middle Manager worker per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.| `category`, `workerVersion`|Varies|
+|`worker/taskSlot/used/count`|Number of busy task slots on the reporting Middle Manager worker per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.| `category`, `workerVersion`|Varies|
 |`worker/task/assigned/count`|Number of tasks assigned to an indexer per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.|`dataSource`|Varies|
 |`worker/task/completed/count`|Number of tasks completed by an indexer per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.|`dataSource`|Varies|
-|`worker/task/failed/count`|Number of tasks that failed on an indexer during the emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.|`dataSource`|Varies|
-|`worker/task/success/count`|Number of tasks that succeeded on an indexer during the emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.|`dataSource`|Varies|
-|`worker/task/running/count`|Number of tasks running on an indexer per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.|`dataSource`|Varies|
+|`worker/task/failed/count`|Number of tasks that failed on an Indexer during the emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.|`dataSource`|Varies|
+|`worker/task/success/count`|Number of tasks that succeeded on an Indexer during the emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.|`dataSource`|Varies|
+|`worker/task/running/count`|Number of tasks running on an Indexer per emission period. This metric is only available if the `WorkerTaskCountStatsMonitor` module is included.|`dataSource`|Varies|
 
 ### Segment metadata cache