Some things to try:
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If you are using Direct mode in the data source settings, try using Proxy mode instead.
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Check the raw query and response from InfluxDB using the Chrome Dev Tools: https://community.grafana.com/t/how-to-troubleshoot-metric-query-issues/50 Is it returning data? If it is, can you paste the response here.
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Change the display style to from “Lines” to “Points” (in case you have sparse data and the lines are not getting connected):
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Also try setting the “Group by time interval” field to
>5m. https://community.grafana.com/t/why-is-my-graph-empty-when-i-zoom-in/24/2