opencensus migrate to opentelemetry

[aimuz]

What happened:

opencensus has already been merged into open-telemetry and has been archived, I think we should switch to open-telemetry

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Agones version:
• Kubernetes version (use kubectl version):
• Cloud provider or hardware configuration:
• Install method (yaml/helm):
• Troubleshooting guide log(s):
• Others:

[aimuz]

https://opentelemetry.io/blog/2023/sunsetting-opencensus/

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[markmandel]

OTEL can be quite painful to setup and run, and we're not doing any tracing, I'm wondering if it makes sense to export straight prometheus metrics instead 🤔

This may end up being a breaking change, primarily for Google Cloud Monitoring.

[aimuz]

If you just export prometheus, it is probably a better way to use prometheus directly.