Updated grafana dashboard with dynamic rate_interval

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

Change-Id: Id437523cc4d610bad79f612701a111a6b03994ea
Related-Bug: PROD-30422
(cherry picked from commit 41d31d33354eeff85cd65b78fae0d5af274172b1)
1 file changed