[Hawkular-dev] Question about Alerts examples

[Jay Shaughnessy]

Hi Anton,

Thanks for investigating this new feature (and new project).   In fact, 
Lucas's examples are so new I haven't had a chance yet to go through 
them in detail, hopefully today.  Let me just try and answer this now 
and possibly revise the examples when I get a chance to review.

With 0.6.0 a client can insert Events via a REST endpoint.  All of the 
send-events*.sh examples are doing this.  They will be persisted and can 
optionally specify a 'DataId' (more on that in a moment).   Also, 
Triggers can now generate an Alert or an Event, so Events can be 
generated when a Trigger's conditions are satisfied.  A Trigger 
specifies one or more Conditions, of which there are several types: 
Threshold numeric conditions, Range numeric conditions, String 
comparison conditions, etc. Conditions are evaluated against Data being 
sent into the alerting engine (via REST).  A Condition specifies a 
DataId and then evaluates against all the datums with that same DataId.

Now, starting in 0.6.0 there is a new condition type, EventCondition.  
The datums for this kind of condition are Events (as opposed to numeric 
for ThresholdCondition, and strings for StringCondition, for example).  
So, if an Event comes via REST API, or is generated by a Trigger, and it 
specifies a DataId, it will then be used for evaluation of any 
EventCondition with that DataId. For example:

Trigger DeploymentFailed
   EventCondition {dataId: "deployer", expression: "text contains 'failed'"}
-->
   Create Alert

The Condition itself is connected to the Trigger via the triggerId.  
Because conditions are owned by a Trigger the triggerId is actually a 
path-variable on the post REST endpoint. Perhaps that is what you were 
looking for?  The same approach is true when specifying Dampening for a 
Trigger.

-Jay

On 11/13/2015 9:04 AM, Anton Hughes wrote:
> Hi all
>
> I have been studying 
> https://github.com/lucasponce/hawkular-examples/tree/master/events - 
> and I have a question.
>
> In the example documentation, I cannot see how an trigger and 
> conditions are related. I would expect there to be some reference 
> between these objects.
>
> Thanks
>
>
> -- 
> Anton Hughes
>
>
>
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> hawkular-dev at lists.jboss.org
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