Trouble with Alerts

Hi everyone,

I have a trouble with alerting in Grafana v.5.3.2.
I have DB monitoring that shows db locks.
I need to send alert if the count of locks is more then 0 during 1 min period.
Graph which shows locks has 2h period.

So I set the rule, created the lock and there is nothing happened.

It seems that Grafana analysis all elements of timeline, regardless the filter value.

Could you please help with it?

Seems Grafana community is not so wide as I expected:)