3dabea0fc2 added some docs with inconsistent usage docs.
This fixes them, and adds a test.
It also adds some other tests and fixes other verb tense
inconsistencies.
Updates tailscale/corp#25278
Change-Id: I94c2a8940791bddd7c35c1c3d5fb791a317370c2
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
- `tailscale metrics print`: to show metric values in console
- `tailscale metrics write`: to write metrics to a file (with a tempfile
& rename dance, which is atomic on Unix).
Also, remove the `TS_DEBUG_USER_METRICS` envknob as we are getting
more confident in these metrics.
Updates tailscale/corp#22075
Signed-off-by: Anton Tolchanov <anton@tailscale.com>