[Internal]: alerts tagging and bulk tagging in O11y solution

[tiamliu]

Description

What: support manual tagging and bulk tagging of alerts in the observability solution
When: 9.3 release
Why: provide custom alerts segmentation to end users

Resources

github issue: https://github.com/elastic/rna-program/issues/40

Which documentation set does this change impact?

Elastic On-Prem and Cloud (all)

Feature differences

The feature is identical in all deployment types

What release is this request related to?

N/A

Serverless release

9.3

Collaboration model

The documentation team

Point of contact.

Main contact: @baileycash-elastic @dominiqueclarke @cnasikas

Stakeholders: @tiamliu @drewpost @jasonrhodes