I would like to get avg number of inserts hourly and also avgg number of transactions running in database
We have performace_schema enabled but need confirmation of other possible ways to get , may triggers or using timestamp columns in tables ( not all tables have them)
Yes, you’d have to create a new graph for that and write the appropriate PromQL query to do that. Look at other graph formulas in PMM for examples. There are a couple in InnoDB Details that do 24hr summaries of different data points.