hanahmily opened a new pull request #5174:
URL: https://github.com/apache/skywalking/pull/5174
Please answer these questions before submitting pull request
- Why submit this pull request?
- [ ] Bug fix
- [x] New feature provided
- [ ] Improve performance
___
### New feature or improvement
The labelFilter supports regular expression to filter labels. This feature
provides a more flexible path for users to extract and aggregate metrics.
For instance, `http_request_count` metric has a `status` label to indicate
the status code. If users want to sum all of 4xx(400, 404 and etc) request,
they can configure `4\d{2}` to match them.
I don't intend to pre-compile the regular expression to improve the
performance due to the low frequency of the Prometheus fetcher/receiver
interval. Before some performance concerns are raised, I prefer to use cleaner
and simpler implement.
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