Data source for telemetry experiments FHR payload

[Gregory Szorc]

On 3/10/14, 8:27 AM, Georg Fritzsche wrote:
> On 10 Mar 2014, at 15:50, Benjamin Smedberg <benjamin at smedbergs.us> wrote:
>> Note comment 3 where we also want to measure some details in telemetry. Do you want to do that in the same bug or put it in another bug?
>
> I would do it in the same bug.
> Looking at the telemetry payload comment specifically, i’m also wondering:
> * what exactly is presence referring to?
> * is going through nsITelemetry.newHistogram() sufficient to get string data in as well (enabled experiments and rejection reasons)?

Histograms can only record numerical values.

AFAICT you'll need to hack up 
toolkit/components/telemetry/TelemetryPing.jsm to add the new data to 
the Telemetry payload. Start at getPayload() and work from there. 
(Telemetry isn't as easily extensible as FHR's data collection mechanism 
in this regard. It's not as easy to inject non-histogram data into 
Telemetry from add-ons as it is with FHR.)