1602659 - Record telemetry when Sync removes keywords

Status: RESOLVED WONTFIX

(Firefox :: Sync, task, P3)

Description

[Lina Butler (ex-Mozilla)]

We should record telemetry whenever:

• We see an incoming record for an item that had a keyword before, but now doesn't.
• We remove and add keywords, via the statements in apply_remote_items.
• We upload records without keywords.

There's probably a better way to encapsulate all this—maybe if we maintained some kind of event log, like bug 1530145 suggests for tracking sync loops. It would also help with diagnostics, so we can report the exact steps Sync took when it merged bookmarks.

We can get some of the way there by storing completion ops, but that could be a privacy concern, depending on what exactly we store—storing values of previous fields is probably a no-no, and we'd need to figure out how to compact and evict them.

Comment 1

[David Durst [:ddurst]]

While this would have helped with the report in bug 1591802, this is likely not going to be useful for much else.