1548472 - Collect telemetry about how is the cache split by the content type

Status: RESOLVED FIXED

(Core :: Networking: Cache, enhancement, P2)

Description

[Michal Novotny [:michal]]

Bug 1547797 will allow to specify different max entry size for given content type. In theory, this might change how is the cache split by the content type. This telemetry will tell us whether we need to partition the cache by content type or not.

Comment 1

[Michal Novotny [:michal]]

Attachment: Bug 1548472 - Collect telemetry about how is the cache split by the content type, r=mayhemer

Like in case of bug 1506534, this telemetry is sampled periodically every time 2GB of data is written to the cache, i.e. when the cache was used for some time and there is a chance that its content has changed significantly.

Comment 2

[Michal Novotny [:michal]]

Attachment: Request for data collection review form

Comment 3

[Chris H-C :chutten|PTO (back March 17)]

Comment on attachment 9062224 [details]
Request for data collection review form

Preliminary notes:
I recommend all permanent collections be covered by regression tests to ensure they continue to work over their lifetimes.

DATA COLLECTION REVIEW RESPONSE:

    Is there or will there be documentation that describes the schema for the ultimate data set available publicly, complete and accurate?

Yes. This collection is Telemetry so is documented in its definitions file [Histograms.json](https://hg.mozilla.org/mozilla-central/file/tip/toolkit/components/telemetry/Histograms.json) and the [Probe Dictionary](https://telemetry.mozilla.org/probe-dictionary/).

    Is there a control mechanism that allows the user to turn the data collection on and off?

Yes. This collection is Telemetry so can be controlled through Firefox's Preferences.

    If the request is for permanent data collection, is there someone who will monitor the data over time?

Yes, Michal Novotny is responsible.

    Using the category system of data types on the Mozilla wiki, what collection type of data do the requested measurements fall under?

Category 1, Technical.

    Is the data collection request for default-on or default-off?

Default on for pre-release channels only.

    Does the instrumentation include the addition of any new identifiers?

No.

    Is the data collection covered by the existing Firefox privacy notice?

Yes.

    Does there need to be a check-in in the future to determine whether to renew the data?

No. This collection is permanent.

---
Result: datareview+

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/dcf3a023d7d0
Collect telemetry about how is the cache split by the content type, r=mayhemer

Comment 5

[Narcis Beleuzu [:NarcisB]]

https://hg.mozilla.org/mozilla-central/rev/dcf3a023d7d0