Exposes some internal state of the sockstats package via the C2N and
PeerAPI endpoints, so that it can be used for debugging. For now this
includes the estimated radio on percentage and a second-by-second view
of the times the radio was active.
Also fixes another off-by-one error in the radio on percentage that
was leading to >100% values (if n seconds have passed since we started
to monitor, there may be n + 1 possible seconds where the radio could
have been on).
Updates tailscale/corp#9230
Signed-off-by: Mihai Parparita <mihai@tailscale.com>
When splitting the radio monitor usage array, we were splitting at now %
3600 to get values into chronological order. This caused the value for
the final second to be included at the beginning of the ordered slice
rather than the end. If there was activity during that final second, an
extra five seconds of high power usage would get recorded in some cases.
This could result in a final calculation of greater than 100% usage.
This corrects that by splitting values at (now+1 % 3600).
This also simplifies the percentage calculation by always rounding
values down, which is sufficient for our usage.
Signed-off-by: Will Norris <will@tailscale.com>
We use it to gate code that depends on custom Go toolchain, but it's
currently only passed in the corp runners. Add a set on OSS so that we
can catch regressions earlier.
To specifically test sockstats this required adding a build tag to
explicitly enable them -- they're normally on for iOS, macOS and Android
only, and we don't run tests on those platforms normally.
Signed-off-by: Mihai Parparita <mihai@tailscale.com>
power state is very roughly approximated based on observed network
activity and AT&T's state transition timings for a typical 3G radio.
Updates tailscale/corp#9230
Updates #3363
Signed-off-by: Will Norris <will@tailscale.com>
