Correct moving average duration in PSI metrics description

[antweiss]

Updated the moving average duration from 3 minutes to 5 minutes for PSI metrics.

Description

300 seconds equals to 5 minutes not 3.

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• ✅ login: antweiss / name: Ant Weiss (997b8d1)

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[antweiss]

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[lmktfy]

Can you point to where in the k/k code it's set to 300 seconds? That will help reviewers.