Unexpected status code 404
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Resolved
Impacted sites should be accessible now.
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Monitoring
I didn't found the culprit, but I upgraded the reverse proxy to the newest version, and gatekeeping Docker's minimum API version check. Some sites are up, monitoring for some time.
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Investigating
I'm investigating the possible cause of the 404 route disruption.
Unexpected status code 522
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Resolved
Reboot after Debian package update results in lost network configuration. I've moved the networking to use NetworkManager instead of the plaintext networking stanza. Things has been rather smooth.
Unexpected status code 405
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Resolved
Should be good now.
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Monitoring
I was using the wrong HTTP method for doing healthcheck.