[Hawkular-dev] HWKMETRICS-83 Create glue code component to integrate with hawkular-bus

[John Mazzitelli]

I can work on a agent PR to strip that out. I have a bunch of TODO comments around the code that should remind me all I need to take out :)

----- Original Message -----
> Hi everyone,
> 
> I sent a pull request to the Metrics repo to implement $subject.
> https://github.com/hawkular/hawkular-metrics/pull/393
> 
> I won't paste here the whole PR description, but the following might be
> of interest.
> 
> There is a new "hawkular-metrics-component" WAR module. It is meant to
> replace "hawkular-metrics-api-jaxrs" module in Hawkular deployments.
> 
> This new WAR is a "super"-module: it uses Maven WAR plugin overlay
> mechanism to add extra classes to the standalone metrics web application.
> 
> The extra classes allow to subscribe to the
> MetricsService#insertedDataEvents observable and publish messages on the
> bus.
> 
> In order to make the migration easy, I have shamelessly copied Alerts'
> AvailDataMessage and MetricDataMessage classes. Theses messages are
> posted on to the "HawkularAvailData" and "HawkularMetricData" topics,
> respectively.
> 
> After this PR is merged we only need to change the agent code to remove
> the "double-push" part. And change Hawkular POM to switch to the new
> Metrics component. That's it.
> 
> I would like to discuss the JSON payload format later. It might need to
> be changed, but let's flip this coin first.
> 
> Thanks,
> Thomas
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