Leader election hardcodes datum-system namespace, causing controllers to reconcile across namespaces

[cc-datum]

Summary

The Milo controller manager uses a hardcoded namespace (datum-system) for leader election. This causes instances deployed in other namespaces to reconcile resources from the datum-system environment/namespace, leading to unexpected reconciliation loops and property flapping in CRDs.

Context

Controllers in different environments (e.g. preview namespaces) still participate in the same leader election due to the fixed datum-system namespace. This leads to multiple Milo instances managing the same resources.

Root Cause

In cmd/milo/controller-manager/controllermanager.go, the leader election namespace is fixed to datum-system:

milo/cmd/milo/controller-manager/controllermanager.go

Line 680 in 50885d5

"datum-system",