Updated grafana dashboard with dynamic rate_interval

- added in one place the rate_interval variable instead of static "[1m]".

Change-Id: If16e5bb4b3c09b6c713f3c73dbfad25a4a6aa2b2
Related-Bug: PROD-30424
Related-Bug: PROD-30422
(cherry picked from commit f6c910e93667140c0744debd2299d0a76ac64451)
2 files changed