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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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| .. | ||
| discovery | ||
| discoveryutils | ||
| testdata | ||
| client.go | ||
| client_test.go | ||
| config.go | ||
| config_test.go | ||
| config_timing_test.go | ||
| relabel_debug.go | ||
| scraper.go | ||
| scrapework.go | ||
| scrapework_test.go | ||
| scrapework_timing_test.go | ||
| targetstatus.go | ||
| targetstatus.qtpl | ||
| targetstatus.qtpl.go | ||