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e56144c7a2
Profile creation was moved outside the descheduling cycle in b214c147,
but reconcileInClusterSAToken() still runs only in runFnc(), after
newDescheduler() returns. This leaves the prometheus client nil when
LowNodeUtilization's New() runs, causing "prometheus client not
initialized" at startup.
Avoid failing at plugin creation time if the prometheus
client is not yet available. Instead, usageClientForMetrics() is now
called at the start of every extension point via a resetUsageClient()
helper, so each descheduling cycle picks up the latest client regardless
of when the SA token is reconciled or rotated.
Fixes: https://github.com/kubernetes-sigs/descheduler/issues/1840
Signed-off-by: Simone Tiraboschi <stirabos@redhat.com>