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NEL almost not reported anymore / very infrequently
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Description

The NELNotReported NELByCountryNotReported started firing today, and indeed we've observed a drop in reported NEL. Below is the kafka-logging w3c.reportingapi.network_error` topic traffic: https://w.wiki/Aa84

2024-07-05-105107_976x707_scrot.png (707×976 px, 76 KB)

Also to be noted is that while traffic went down significantly it isn't completely at zero, i.e. a slow trickle of messages still going to the topic

2024-07-05-110539_1003x700_scrot.png (700×1 px, 59 KB)

Event Timeline

Mentioned in SAL (#wikimedia-operations) [2024-07-05T08:55:26Z] <godog> silence NELNotReported NELByCountryNotReported until Tues - T369345

Vgutierrez triaged this task as High priority.
Vgutierrez edited projects, added Traffic; removed SRE.

Change #1052271 had a related patch set uploaded (by Vgutierrez; author: Vgutierrez):

[operations/puppet@production] hiera: Don't delete X-Forwarded-Proto request header

https://gerrit.wikimedia.org/r/1052271

Change #1052271 merged by Vgutierrez:

[operations/puppet@production] hiera: Don't delete X-Forwarded-Proto request header

https://gerrit.wikimedia.org/r/1052271

Fixed by restoring X-Forwarded-Proto header on haproxy -> varnish traffic.