Re: FW: Error in reminder keyword

[Martin Pala]

Rishikesh Dongre wrote:
> I was looking into this keyword because i want to see if it is feasible to 
> perform multiple time step/threshold reminders.
> What I mean by that is for example when it is 85%, it would remind 
every four hours, when it is 90%, it would be every hour
> and when it is 92% every 15 minutes, and when over 95%, every five 
minutes. And it should not send all reminders at same time.
> Please suggest.

Every testing rule is standalone, even if it tests the same service 
property. If you define several error levels, such as:

 1. if space usage > 75% then ...
 2. if space usage > 85% then ...
 3. if space usage > 90% then ...
 4. if space usage > 92% then ...

then monit compares the space usage four times and do the appropriate 
action related to all given testing rules which match the condition. 
Each testing rule maintains its own state. Monit doesn't group these 
testing rules - if the usage is for example 87%, then rules 1+2 match 
and their reminder is applied independently.

With current monit version, there is probably the (complex) workaround - 
example:
--8<--
 check device datafs-75 with path /dev/sda5
   if space usage > 75% then alert
   alert address@hidden with reminder on 100 cycles

 check device datafs-85 with path /dev/sda5
   if space usage > 85% then exec "monit unmonitor datafs-75"
     else if passed then exec "monit monitor datafs-75"
   alert address@hidden with reminder on 50 cycles

 check device datafs-90 with path /dev/sda5
   if space usage > 90% then exec "monit unmonitor datafs-85"
     else if passed then exec "monit monitor datafs-85"
   alert address@hidden with reminder on 5 cycles
--8<--
Each error level is defined in its own service container. As the error 
level increases, the lower levels monitoring is disabled. When the space 
usage decrease, the lower level monitoring is enabled again.


More complex rules with common state and multiple error levels are not 
supported currently. It can be implemented in the future if people agree 
(volunteers are welcomed ;)

Possible syntax:

--8<--
 if space usage
  > 75%     then ...
  > 85%     then ...
  > 90%     then ...
  > 92%     then ...
  recovered then ...   # note: equals <=75%
--8<--

or

--8<--
 if space usage > 75%     then ...
 else if        > 85%     then ...
 else if        > 90%     then ...
 else if        > 92%     then ...
 else if        recovered then ...
--8<--



Martin