Webhooks don't seem fired

We configure notifications.webhooks using an encrypted url here https://github.com/ruby/ruby/blob/9948addda67f4b7a6e3575f1eba9025f998811d2/.travis.yml#L535-L539.

In recent failed builds like the following ones, it seems we didn’t receive requests to the webhook url:
https://travis-ci.org/github/ruby/ruby/builds/676055110
https://travis-ci.org/github/ruby/ruby/builds/676057964
https://travis-ci.org/github/ruby/ruby/builds/676103213
https://travis-ci.org/github/ruby/ruby/builds/676480292
https://travis-ci.org/github/ruby/ruby/builds/676497715

According to Webhooks don't fire, I think I need you to take a look at the logs which are not visible on our side. Could you check notification logs of these builds?

FYI, the last webhook we successfully got was from https://travis-ci.org/github/ruby/ruby/builds/671188703 on Apr 5th.

Today I saw it worked at this job https://travis-ci.org/github/ruby/ruby/builds/677240027. So probably the issue is resolved from today somehow.

We didn’t receive a webhook for https://travis-ci.org/github/ruby/ruby/builds/677961401. So the issue still persists.

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