API limit is reached

Hi there,
I’m getting the “API limit is reached” message in my panels (one dashboard with around 40 panels).
I think is not the API rate limit from Instana, because from the API I got “x-ratelimit-remaining: 18939” and I’m using Instana Datasource on Grafana with multiples API Key from the same “Instana Account”.

It looks like a block from Grafana instance itself (http reponse 429: too many requests).
Docker container log:

lvl=info msg="Request Completed" logger=context userId=7 orgId=1 uname="XXXXX" method=POST path=/api/datasources/proxy/1/instana/api/application-monitoring/analyze/call-groups **status=429** remote_addr=XXXX time_ms=316 size=68 referer="https://XXXXXX/d/DYh1m1-Zz/XXXXX?orgId=1&XXX=tv&refresh=30s"

Grafana has a limit from browser o from the API itself ?.
Any help is welcome!

** I don’t see nothing on logs level = debug