2 Commits (4abd4703224ae8ca2cfeb5f37618953716193505)

Author	SHA1	Message	Date
James Tucker	5c38f0979e	tsweb/promvarz: fix repeated expvar definition in test ... expvar can only be defined once, so running tests with a repeat counter will fail if the variables are defined inside of the test function. Observed failure: ``` --- FAIL: TestHandler (0.00s) panic: Reuse of exported var name: gauge_promvarz_test_expvar [recovered] panic: Reuse of exported var name: gauge_promvarz_test_expvar goroutine 9 [running]: testing.tRunner.func1.2({0x100f267e0, 0x1400026e770}) /usr/local/go/src/testing/testing.go:1526 +0x1c8 testing.tRunner.func1() /usr/local/go/src/testing/testing.go:1529 +0x364 panic({0x100f267e0, 0x1400026e770}) /usr/local/go/src/runtime/panic.go:884 +0x1f4 log.Panicln({0x140000b8e20?, 0x1a?, 0x1400026e750?}) /usr/local/go/src/log/log.go:398 +0x60 expvar.Publish({0x100e2b21d, 0x1a}, {0x100fd7a08?, 0x140000232c0}) /usr/local/go/src/expvar/expvar.go:284 +0xc0 expvar.NewInt(...) /usr/local/go/src/expvar/expvar.go:304 tailscale.com/tsweb/promvarz.TestHandler(0x14000082b60) /Users/charlotte/ts-src/tailscale/tsweb/promvarz/promvarz_test.go:18 +0x5c testing.tRunner(0x14000082b60, 0x100fd5858) /usr/local/go/src/testing/testing.go:1576 +0x104 created by testing.(*T).Run /usr/local/go/src/testing/testing.go:1629 +0x370 FAIL tailscale.com/tsweb/promvarz 0.149s ``` Fixes #8065 Signed-off-by: James Tucker <james@tailscale.com>	2 years ago
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