https://aws.amazon.com/premiumsupport/knowledge-center/troubleshoot-http-5xx/
HTTP 502 (Bad Gateway)
HTTP 503 (Service Unavailable)
HTTP 504 (Gateway Timeout)
HTTP 526 Invalid SSL certificate
K8s:
Readiness probe failed: HTTP probe failed with statuscode: 500
systemctl status php-fpm
kubectl get ing
5XX, 502, 503, 504, 526
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