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Change-Prop should report 400 errors from endpoints
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Description

A 400 received by change-prop from an endpoint in most cases indicates that the service is configured incorrectly and provides incorrect parameters to the endpoint. Change-prop should loudly log such errors for better observability.

Event Timeline

Mentioned in SAL (#wikimedia-operations) [2019-07-30T22:11:57Z] <ppchelko@deploy1001> Started deploy [changeprop/deploy@76b6639]: Report 400 errors by default. T229277

Mentioned in SAL (#wikimedia-operations) [2019-07-30T22:13:26Z] <ppchelko@deploy1001> Finished deploy [changeprop/deploy@76b6639]: Report 400 errors by default. T229277 (duration: 01m 29s)