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### Describe Your Changes
Currently, vmagent always uses a separate `http.Client` for every group
watcher in Kubernetes SD. With a high number of group watchers this
leads to large amount of opened connections.
This PR adds 2 changes to address this:
- re-use of existing `http.Client` - in case `http.Client` is connecting
to the same API server and uses the same parameters it will be re-used
between group watchers
- HTTP2 support - this allows to reuse connections more efficiently due
to ability of using streaming via existing connections.
See this issue for the details and test results -
https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5971
### Checklist
The following checks are **mandatory**:
- [ ] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).
---------
Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com>
Co-authored-by: Roman Khavronenko <roman@victoriametrics.com>
(cherry picked from commit
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.. | ||
testdata | ||
api_watcher_test.go | ||
api_watcher.go | ||
api.go | ||
common_types.go | ||
endpoints_test.go | ||
endpoints.go | ||
endpointslice_test.go | ||
endpointslice.go | ||
ingress_test.go | ||
ingress.go | ||
kubeconfig_test.go | ||
kubeconfig.go | ||
kubernetes.go | ||
node_test.go | ||
node.go | ||
pod_test.go | ||
pod_timing_test.go | ||
pod.go | ||
service_test.go | ||
service.go |