TAG feedback on use of variables vs. filters

[horovits]

Following the new [RFC] Dashboard Variables for OpenSearch Dashboards #11550 opensearch-project/OpenSearch-Dashboards#11550
@anirudha / @yubonluo to

• formulate best practices on when to use variables vs. Filters

• update documentation to reflect it

• proposal to adapt the filters UX

• TAG Observability meeting follow-up, 25 March, 2026