Missing telemetry to help remove alerting deprecated 7.x features

[mikecote]

How to collect telemetry data: https://github.com/elastic/kibana/tree/master/src/plugins/usage_collection

This issue captures additional points of data we should track to help us understand the impact of removing a feature. Some of these features are already deprecated and the telemetry will help understand when we can remove such features, while others are not deprecated yet but the data can provide better insights on how we can deprecate or remove those features.

Deprecated?	Description	Telemetry questions	GitHub Issue
Yes, but more could be done (server log warning on usage, warning response header)	Legacy alert HTTP APIs	What percentage of clusters are using the legacy alert HTTP APIs? How many times per cluster? What is the breakdown by endpoint?	#90383 #111894
Yes, but more could be done (server log warning on usage, warning response header)	Legacy action HTTP APIs	What percentage of clusters are using the legacy action HTTP APIs? How many times per cluster? What is the breakdown by endpoint?	#90382 #111896
No	Removing support for limiting "fields" returned by the find rules HTTP API	What percentage of clusters are using the "fields" attribute on the find rules HTTP API? How many times per cluster?	#70696 #112009
No, option w/ new terminology not available	Renaming alert saved-object type and attributes	What percentage of clusters are using our APIs with attributes using the old terminology (ex: alertTypeId instead of ruleTypeId)? How many times per cluster? What is the breakdown by attribute?	#102248 and #100068
No, option w/ new terminology not available	Renaming action saved-object type and attributes	What percentage of clusters are using our APIs with attributes using the old terminology (ex: actionTypeId instead of actionTypeId)? How many times per cluster? What is the breakdown by attribute?	#102248 and #100068
Yes	Removing deprecated kibana.yml configuration settings	- What percentage of clusters are using xpack.actions.whitelistedHosts? - What percentage of clusters are using xpack.actions.customHostSettings[<index>].ssl.rejectUnauthorized? - What percentage of clusters are using xpack.actions.rejectUnauthorized? - What percentage of clusters are using xpack.actions.proxyRejectUnauthorizedCertificates? - What percentage of clusters are using xpack.alerts.healthCheck? - What percentage of clusters are using xpack.alerts.invalidateApiKeysTask.interval? - What percentage of clusters are using xpack.alerts.invalidateApiKeysTask.removalDelay? - What percentage of clusters are using xpack.task_manager.max_workers values with a value greater than 100?	#76385 and #100289
No, need warnings in such use case	Remove legacy RBAC exemption for rule actions	What percentage of clusters are using the legacy RBAC exemption for actions? How many times per cluster?	#90386

[elasticmachine]

Pinging @elastic/kibana-alerting-services (Team:Alerting Services)

[ymao1]

Information about how we might build and use a custom index for our specific telemetry fields in this comment.

[chrisronline]

Update here on adding the telemetry data to help us eventually remove these

Description	Status
Legacy alert HTTP APIs	✅ #111894
Legacy action HTTP APIs	✅ #111896
Removing support for limiting "fields" returned by the find rules HTTP API	✅ #112009
Renaming alert/action saved-object type and attributes	✅ #112271
Removing deprecated kibana.yml configuration settings	✅ #112585
Remove legacy RBAC exemption for rule actions	✅ #112355

[chrisronline]

@mikecote All telemetry are now complete for this issue. We should have all this data available soon. Can we close this out?

[gmmorris]

@chrisronline yup :) I'll let you have the pleasure.

[chrisronline]