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tailscale/tsweb
Anton Tolchanov 8546ff98fb tsweb: move varz handler(s) into separate modules
This splits Prometheus metric handlers exposed by tsweb into two
modules:
- `varz.Handler` exposes Prometheus metrics generated by our expvar
  converter;
- `promvarz.Handler` combines our expvar-converted metrics and native
  Prometheus metrics.

By default, tsweb will use the promvarz handler, however users can keep
using only the expvar converter. Specifically, `tailscaled` now uses
`varz.Handler` explicitly, which avoids a dependency on the
(heavyweight) Prometheus client.

Updates https://github.com/tailscale/corp/issues/10205

Signed-off-by: Anton Tolchanov <anton@tailscale.com>
2 years ago
..
promvarz tsweb: move varz handler(s) into separate modules 2 years ago
varz tsweb: move varz handler(s) into separate modules 2 years ago
debug.go tsweb: move varz handler(s) into separate modules 2 years ago
debug_test.go all: update copyright and license headers 2 years ago
log.go all: update copyright and license headers 2 years ago
tsweb.go tsweb: move varz handler(s) into separate modules 2 years ago
tsweb_test.go tsweb: move varz handler(s) into separate modules 2 years ago