We've basically never failed over between toolsdb hosts when not in the midst of a disaster.
This is an action item from https://wikitech.wikimedia.org/wiki/Incident_documentation/20190214-labsdb1005#Actionables
Description
Description
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Resolved | • Bstorm | T216208 ToolsDB overload and cleanup | |||
| Duplicate | None | T216770 toolsdb: document (and test?) failover plan |