Improve alert with mininimal interval/duration and retention configuration keys

[ajgringo619]

I would like to see glances to have the ability to remove warning/critical issue messages that are no longer relevant, either by time-out or by only displaying a set amount of messages. As you can see from the posted screenshot, my screen gets filled up pretty fast when there's a lot of stuff going on:

Now, since these messages can still be relevant, I'm not suggesting automatically removing them; just give use the option to limit their number to something a little more reasonable.

[nicolargo]

Hi @ajgringo619

in the develop branch, i just added a feature to be able to tweek the alert plugin from the Glances configuration file:

[alert]
disable=True
# Maximum number of alerts to display (default is 10)
; max_events=10

This is just a first step.

I also want to open the discussion regarding another enhancement by making the minimum time between two alerts configurable ?

For example:

First alert starts at 01:00:00 with a duration of 1 minutes.
Second alert starts at 01:01:30 with a duration of 2 minutes.
Third alert starts at 01:04:00 with a duration of 30 seconds.

Actualy Glances will display 3 alerts.

If we set the min_delay_between_events to 60 seconds, the future Glances version will display only one alerts.

What do you think @ajgringo619 ?

[ajgringo619]

This looks great. As an additional setting, allow each type of alert to be configurable separately, so that a user can decide how long to show a critical alert over a warning.

[nicolargo]

@ajgringo619 something like that:

[alert]
disable=True
# Maximum number of alerts to display (default is 10 events)
; max_events=10
# Minimal delay between events (default is 60 seconds)
# If delay between 2 events is lower than the value, then the events are merged
; min_delay_between_events=60
# Alert retention (by default, no retention)
# Define the time (in seconds) events are stored and displayed
;warning_retention=1000
;critical_retention=3600

[ajgringo619]

This looks great - thank you!

[nicolargo]

Done in the develop branch for the duration and interval configuration key.

Configuration file example:

[alert]
disable=False
# Maximum number of events to display (default is 10 events)
max_events=10
# Minimum duration for an event to be taken into account (default is 6 seconds)
min_duration=6
# Minimum time between two events of the same type (default is 6 seconds)
# This is used to avoid too many alerts for the same event
# Events will be merged
min_interval=6

TODO: add retention for warning and critical.