Updated grafana dashboard with dynamic rate_interval

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

Change-Id: If4e5bdd8f0fa99578f8cbc9eb0d6d59b733daf4b
Related-Bug: PROD-30424
(cherry picked from commit 891ad74e0d6a787da980192c4efd111f5c8fde6d)
1 file changed