This probe expired for 56, and according to ehsan in bug 1378146 comment 35, it's okay to be removed (since <isindex> was removed in bug 1266495 anyways).
All that is needed to be done here is a partial backout of bug 1356181...
Assignee: nobody → ehsan
Pushed by email@example.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/541d60bea382 Backout changeset 648169abf928 (bug 1356181) to remove the expired FORM_ISINDEX_USED telemetry probe
https://hg.mozilla.org/mozilla-central/rev/541d60bea382 - landed 7h ago.
Status: NEW → RESOLVED
Last Resolved: a year ago
status-firefox56: --- → fixed
Resolution: --- → FIXED
Target Milestone: --- → mozilla56
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