Updating registered telemetry events in an add-on during a single Firefox session

[Richard Newman]

This capability was added pretty recently:

https://bugzilla.mozilla.org/show_bug.cgi?id=1302681

I don't see a way to unregister through this API. Naïvely I would expect
re-registering the same events from the same add-on to be a no-op, so
perhaps that's two bugs for the Telemetry component to tackle, and one of
them might be upliftable.

Georg is the person to ask about this, I think; adding him to the To line
to make sure he sees this!

On Fri, Oct 13, 2017 at 1:37 PM, Jim Porter <jporter at mozilla.com> wrote:

> I'm one of the developers on Lockbox[1], an embedded WebExtension that
> uses XPCOM to handle telemetry. I've run into an issue where updating our
> add-on makes the telemetry API unhappy because we're re-registering events
> with the same category name. I'd like to re-run
> `nsITelemetry.registerEvents` in case we've added something to our
> telemetry. Is there a way to unregister events during the add-on's
> shutdown? (Currently, we're running `registerEvents` in our bootstrap.js's
> `startup` function[2].)
>
> I have a workaround in progress that appends a version to our main
> category name (in this case "lockboxv0") so that we can just increment the
> version anytime we change the events we want to record. Is there a better
> way?
>
> - Jim
>
> [1] https://github.com/mozilla-lockbox/lockbox-extension
> [2] https://github.com/jimporter/lockbox-extension/blob/master/s
> rc/bootstrap.js#L12-L22
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