I updated influxdb from 1.8 to influxdb2 after updation the old datasource is working fine but when I change the month in the calendar in the time range its showing no data. How to resolve this issue?
Hi @wariku24shivi,
Welcome to the 
community support forums !!
Hmm, this might be not related to Grafana but with the InfluxDB as this is the closest I found when moving from InfluxDB v1.x to 2.x
I also know that with v2 data is saved in Buckets so that might be the reason that the previous data is not saved and therefore no data is available.
The best would be to ask in their community support section about it as there might be a configuration option which can bring the old data.
I hope this helps.
Thank you. I hope they will give any solution