.nodata(600)=0 means there should be data for 600 seconds. But the recovery alert recovers instantly.

Steps to reproduce:

1. Create Trigger expression:  " * {host1:item_status.nodata(30)}

   =1*"

2. Create Recovery expression: " * {host1:item_status.nodata(600)}

   =0* "

3. Stop the host for 5-10 minute.
4. Start the host.
5. We get recovery alert instantly.

Expected:

1. Create Trigger expression:  " * {host1:item_status.nodata(30)}

   =1*"

2. Create Recovery expression: " * {host1:item_status.nodata(600)}

   =0* "

3. Stop the host for 10 minute.
4. Start the host.
5. Wait for next 10 minutes for valid data.
6. Send recovery alert.