adds throttle grace

[kevincobain2000]

Consider throttled if alert is in grace period.
Use case is to ignore first few alerts. In order to shh occasional alerts.

[gizumon]

Thank you for your change.

Just to clarify the spec, let me make sure the difference between THROTTLE_DURATION and THROTTLE_GRACE_SECONDS.

Am I correct in assuming that the difference between these variables is in "seconds" or "minutes" and the following settings work as the same behavior?

• THROTTLE_GRACE_SECONDS=300
• THROTTLE_DURATION=5

Also, the reason to keep THROTTLE_DURATION is for supporting the compatibility, correct?

[kevincobain2000]

@gizumon
THROTTLE_GRACE_SECONDS is a new feature.

Example, you set THROTTLE_GRACE_SECONDS=5 #seconds, then the new alerts in 5 seconds will not be notified. After 5 seconds are passed, the notification and throttling will begin.

Main reason I used seconds for THROTTLE_GRACE_SECONDS is to have more control on the period, as many users could have THROTTLE_DURATION=1 #minute and we want to set a smaller value for THROTTLE_GRACE_SECONDS.
Second reason is compatibility as I want to change THROTTLE_DURATION to seconds too, but that would lead to v2.

Example 1:

Error message = I am alert #occurs every hour
THROTTLE_GRACE_SECONDS=5 #seconds
THROTTLE_DURATION=5 #minutes
#This error will never be reported

Example 2:

Error message = I am alert #occurs every minute
THROTTLE_GRACE_SECONDS=5 #seconds
THROTTLE_DURATION=5 #minutes
#The first error will not be reported (1st minute)
#The second error will be reported (2nd minute)
#The third, fourth, fifth errors will not be reported until (5 mins and 5 seconds)

PS: I will write more tests on it, I think the implementation has a bug.

[kevincobain2000]

Buggy and unable to add this feature.