Allow Loki gateway rolling updates on music

k8s-ng/core/prom-stack/loki-values.yaml

@@ -83,6 +83,10 @@ gateway:
   replicas: 1
   nodeSelector:
     kubernetes.io/hostname: music
+  # The chart defaults to required pod anti-affinity. With a single eligible
+  # node that deadlocks every rolling update because the surge pod cannot be
+  # scheduled until the old pod is gone. Both pods may briefly share music.
+  affinity: null
   priorityClassName: monitoring-critical
   verboseLogging: false
   resources: