We must have the following stage option usage counters at the process level (i.e., as part of the 'serverStatus' command response). For options that have a default value, we are not interested in counting the explicitly set default values. The default value counts can be inferred from the total number of change streams (i.e., "metrics.changeStreams.cursor.totalOpened").

• "metrics.changeStreams.option.showExpandedEvents" (counter)
• Available since v7.1.
• Previous name: "metrics.changeStreams.showExpandedEvents"
• We need to file a downstream DWH / TOOLS ticket to prevent unexpected usage.

• "metrics.changeStreams.option.showMigrationEvents" (counter)
• Counts the use of "showMigrationEvents" option of the $changeStream stage.

• "metrics.changeStreams.option.showSystemEvents" (counter)
• Counts the use of "showSystemEvents" option of the $changeStream stage.

• "metrics.changeStreams.option.showRawUpdateDescription" (counter)
• Counts the use of "showRawUpdateDescription" option of the $changeStream stage.

• "metrics.changeStreams.option.ignoreRemovedShards" (counter)
• "metrics.changeStreams.option.matchCollectionUUIDForUpdateLookup" (counter)
• "metrics.changeStreams.option.startAfter" (counter)
• "metrics.changeStreams.option.resumeAfter" (counter)
• "metrics.changeStreams.option.startAtOperationTime" (counter)
• "metrics.changeStreams.option.fullDocument.required" (counter)
• "metrics.changeStreams.option.fullDocument.updateLookup" (counter)
• "metrics.changeStreams.option.fullDocument.whenAvailable" (counter)
• "metrics.changeStreams.option.fullDocumentBeforeChange.required" (counter)
• "metrics.changeStreams.option.fullDocumentBeforeChange.whenAvailable" (counter)
• "metrics.changeStreams.scope.cluster" (counter)
• "metrics.changeStreams.scope.db"  (counter)
• "metrics.changeStreams.scope.collection" (counter)

We must have the following change stream cursor option metrics at the process level. 

• "metrics.changeStreams.option.cursor.batchSize" (histogram)
• Can be set on either of 'aggregate' or 'getMore' commands.
• If not specified we don't count anything.
• Buckets? Unspecified?

• "metrics.changeStreams.option.cursor.maxAwaitTimeMS" (histogram)
• Can be set on either of 'aggregate' or 'getMore' commands.
• If not specified we don't count anything.
• If specified and is equal to the current default 1000ms - count it anyways.