Sync prometheus_alert_db_indicators_settings with any changes from prometheus front

Why this issue?

!97087 (merged) introduced BBM health status to check Patroni Apdex SLI as well, to make it possible it captured Thanos URL, SLI (Prom)Query strings and the SLO numbers in 'ApplicationSetting.prometheus_alert_db_indicators_settings' attribute.

We have to find a way to make this setting in sync with any future changes on the SLI queries, thanos URL endpoint or the SLO number.

Note: Later prometheus_alert_db_indicators_settings was extended to support WAL rate configs as part of #357251 (closed)

Proposed solutions

• Documentation / code comments
• In runbooks