Is it possible to configure Grafana to send an alert if there is no new data for a query for e.g. 30 minutes?
Add an alert as following:
Rule Name: NoData, Evaluate every: 1m, For: 30m Condition When: last() of: query(A,10m,now) has no value
Rule Name: NoData, Evaluate every: 1m, For: 30m
Condition When: last() of: query(A,10m,now) has no value