LOG-2588: Update FluentdQueueLengthIncreasing alert to Warning

[jcantrill]

Description

This PR updates the alert to warning

Links

• https://issues.redhat.com/browse/LOG-2588

[jcantrill]

/cherrpick release-5.4

[openshift-ci]

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[vimalk78]

/lgtm

[vparfonov]

/lgtm

[openshift-ci]

@jcantrill: all tests passed!

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[jcantrill]

/cherrypick release-5.4

[openshift-cherrypick-robot]

@jcantrill: new pull request created: #1518

In response to this:

/cherrypick release-5.4

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