Like net/http/pprof has. Updates tailscale/corp#18514 Change-Id: I264adb6dcf5732d19707783b29b7273b4ca69cf4 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
And delete Debug.GoroutineDumpURL, which was already in c2n. Updates #8923 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>