Before upgrading loki I have pulled the latest loki release to test it on my localhost:
$ docker run grafana/loki:k64-12253ec

and I see the following errors in the logs:

level=error ts=2021-09-24T06:31:21.506378051Z caller=frontend_processor.go:70 msg="error processing requests" address=127.0.0.1:9095 err="rpc error: code = Unavailable desc = closing transport due to: connection error: desc = \"error reading from server: EOF\", received prior goaway: code: ENHANCE_YOUR_CALM, debug data: too_many_pings"

I am wondering if this is known and if you have a fix for it?