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miketaylr/gist:c6eb15a71427fbf31d84dbd68f004f9c

Created April 6, 2017 16:16
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gistfile1.txt
USE_COUNTER2_DEPRECATED_AppCache_PAGE
<https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=bucket-0!bucket-1!bucket-2&cumulative=0&end_date=null&keys=&max_channel_version=release%252F52&measure=USE_COUNTER2_DEPRECATED_AppCache_PAGE&min_channel_version=release%252F44&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=null&trim=1&use_submission_date=0>
Data is a bit hard to read, but it looks like usage is generally ~3%. IIRC, think this just measures if a manifest file was seen.
The number goes up quite a bit for Firefox Mobile (Android), FWIW.
We also have use counters for AppCache JS API methods and getters:
http://searchfox.org/mozilla-central/source/dom/base/UseCounters.conf#52
Looking at just a couple:
appcache.update:
<https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=bucket-0!bucket-1!bucket-2&cumulative=0&end_date=null&keys=&max_channel_version=release%252F52&measure=USE_COUNTER2_OFFLINERESOURCELIST_UPDATE_PAGE&min_channel_version=release%252F49&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=null&trim=1&use_submission_date=0>
Looks like it's ~2%.
appcache.status:
<https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=bucket-0!bucket-1!bucket-2&cumulative=0&end_date=null&keys=&max_channel_version=release%252F52&measure=USE_COUNTER2_OFFLINERESOURCELIST_STATUS_getter_PAGE&min_channel_version=release%252F49&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=null&trim=1&use_submission_date=0>
~2.5%
@mikewest
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mikewest commented Apr 6, 2017

Wow. Those numbers are ~an order of magnitude higher than what we're seeing in Chrome for overall usage:

API calls

manifest in a document

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