[grafana] Set GOMAXPROCS and GOMEMLIMIT environment variables based on container resources #3138
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Set
GOMAXPROCS
andGOMEMLIMIT
environment variables based on container resources. This should reduce potential CPU throttling and OOMKills on containers.The
resourceFieldRef
is a very specific Kubernetes directive that is created specifically for passing resource-related values, which rounds up the CPU value to the nearest whole number (e.g. 250m to 1) and passes the memory as a numeric value; so64Mi
would result in the environment variable being set to67108864
. This by design makes it completely compatible with Go's API.An example is documented within Kubernetes documentation itself: https://kubernetes.io/docs/tasks/inject-data-application/environment-variable-expose-pod-information/#use-container-fields-as-values-for-environment-variables.
Inspired by traefik/traefik-helm-chart#1029.
Implementation notes: