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docs: mention about reconciliation issue in hpa docs

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During reconciliation of cephobjectstore, Rook operator resets the value
of replica count by the HPA and HPA brings back it up when it notices
the desired count for replica change.

Signed-off-by: Jiffin Tony Thottan <jthottan@redhat.com>
(cherry picked from commit 823c06da44)
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Jiffin Tony Thottan authored and Mergify committed 2023-04-20 13:24:38 +00:00
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commit bce388ebbe
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Documentation/Storage-Configuration/Monitoring/ceph-monitoring.md
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@@ -300,3 +300,6 @@ spec:
sum(rate(ceph_rgw_put[2m])) # prometheus query used for autoscaling
threshold: "90"
```
!!! warning
During reconciliation of a `CephObjectStore`, the Rook Operator will reset the replica count for RGW which was set by horizontal pod scaler. The horizontal pod autoscaler will change the again once it re-evaluates the rule. This can result in a performance hiccup of several seconds after a reconciliation. This is briefly discussed (here)[https://github.com/rook/rook/issues/10001]