Fix metrics when delete non existing page; Port [#18618] to master-2.x #18622
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### What changes are proposed in this pull request? Fix metrics when delete non existing page ### Why are the changes needed? When deleting non-existing page we see a abnormal spike in PageAge. Still doesn't know why we have abnormal PageAge but since it's non-existing page we would not able to read it as well so it make sense to not record the age. Also we continue to delete page from page store if we didn't find it in metastore so we avoid inconsistency between pagestore and metastore ### Does this PR introduce any user facing changes? na pr-link: #18618 change-id: cid-7d4803cb2d8c433d3ad077a7bf9e3074d91b3389
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What changes are proposed in this pull request?
Fix metrics when delete non existing page
Why are the changes needed?
When deleting non-existing page we see a abnormal spike in PageAge. Still doesn't know why we have abnormal PageAge but since it's non-existing page we would not able to read it as well so it make sense to not record the age.
Also we continue to delete page from page store if we didn't find it in metastore so we avoid inconsistency between pagestore and metastore
Does this PR introduce any user facing changes?
na
[This is an auto-generated PR to cherry-pick committed PR #18618 into target branch master-2.x]