JS error: feature named `performanceMetrics` was not found

[etsystoyan]

Hello folks, Sentry (js error logger) surfaced an error on our site "feature named performanceMetrics was not found"

First seen 8 days ago

Only happens when the user agent is DuckDuckGo Mobile or DuckDuckGo (in many versions)

We suspect it may somehow be related to #3231 but would love your opinion

[rdhelms]

We also recently started seeing this error in our Sentry reports. Assuming the source is one of these:
https://github.com/search?q=org%3Aduckduckgo+%22feature+named%22&type=code

Here's also some additional context from what we're seeing in Sentry

[miasma13]

@etsystoyan @rdhelms
Thanks for reporting, we have already identified the cause of the issue and the mitigation has been rolled out (internal ref: https://app.asana.com/1/137249556945/task/1213190209205938).
The configuration update disabling the flow that caused the reported error was released on Feb 9th, can you both confirm the rate of errors trending down from that point?

[etsystoyan]

yes, thank you @miasma13! The number of errors is down to a trickle now

[samsymons]

I'll close this since the issue looks resolved - thanks for reporting this, and thanks @miasma13 for the update!