Enable percentage/percentile metrics for event definitions.

[dennisoelkers]

Description

Motivation and Context

This PR is enabling missing metrics in event definitions. Previously, only metrics which take a field only as parameter were usable. This change is now enabling other metrics too by:

• using SeriesSpec in event definitions instead of custom abstraction
• adding migration which renames function to type field in MongoDB
• adds frontend support for additional parameters to percentage/percentile

Fixes #10082.

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[janheise]

LGTM!

[HenryTheSir]

Hi @bernd ,
as this change is also a breaking change in the rest api, can we get this documented?

This broke our clusters after our config deployment pushed the definitions in the "old" style (and the api didn't reject them). Its currently possible to deploy non functional event defintiions via api.
-> I must correct myself, the changes got deployd against an server with 5.1 while the master was already on 5.2 and the migration of definitions already run. A server on 5.2 does not accept requests with missing fields

-> Maybe the clustermember should reject changes if it detects, that the leader is already running a newer version?

Field function gets renamed to type

best regards