I had setup grafana on Google Kubernetes Engine in various ways and tried to connect to the cloud sql db , but have been facing the same error, ‘dial tcp : connect: connection timed out’. I have installed grafana in 3 ways according to the following links:
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By creating seperate yaml files(https://devopscube.com/setup-grafana-kubernetes/)
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By pulling the docker image and deploying (https://www.metricfire.com/blog/deploying-grafana-to-kubernetes)
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By using the click-to-deploy apps provided by gcp themselves