## What this PR does / why we need it:
This PR addresses #10208 by checking whether the request method is valid.
For invalid methods we set `method="invalid_method"` label so that operators
can stil see traffic in the metrics but without unbound label value.
## Types of changes
<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
- [x] Bug fix (non-breaking change which addresses an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] CVE Report (Scanner found CVE and adding report)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)
- [ ] Documentation only
## How Has This Been Tested?
I tested by building the image locally using `make build && make image`
and running the image in minikube.
The change has a fairly narrow scope so should be low risk.
## Checklist:
<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
- [ ] My change requires a change to the documentation.
- [ ] I have updated the documentation accordingly.
- [x] I've read the [CONTRIBUTION](https://github.com/kubernetes/ingress-nginx/blob/main/CONTRIBUTING.md) guide
- [x] I have added unit and/or e2e tests to cover my changes.
- [x] All new and existing tests passed.
* exclude creation and exporting of socket metrics via flag
* make exclude metric naming more consistent
* fix connect time metric update
* add documentation
* e2e test
* improve creation of metric mapping
* clean prometheus metrics
- add new histogram metrics with consistent names
- deprecate summary metrics with inconsistent names
* update prometheus metrics tests
* remove ingress_upstream_header_seconds metric
It hasn't been released so it is safe. Use header_duration_seconds metric.
* add documentation on prometheus metrics
This commit introduces a backwards compatible command line option
--report-status-classes which will enable reporting response status classes
(2xx, 3xx..) instead of status codes in exported metrics.
* Initial work on chrooting nginx process
* More improvements in chroot
* Fix charts and some file locations
* Fix symlink on non chrooted container
* fix psp test
* Add e2e tests to chroot image
* Fix logger
* Add internal logger in controller
* Fix overlay for chrooted tests
* Fix tests
* fix boilerplates
* Fix unittest to point to the right pid
* Fix PR review
* fix inconsistent-label-cardinality
for prometheus metrics: nginx_ingress_controller_requests
* add host to collectorLabels only if metricsPerHost is true
When serving many hosts from one nginx, the metrics may become too
numerous for Prometheus. Add a flag to disable the host label, so
that metrics are totalled across all hosts.
