types/logger, logpolicy: disable rate limiting, don't upload on Plan 9

To ease local debugging and have fewer moving pieces while bringing up
Plan 9 support.

Updates #5794

Change-Id: I2dc98e73bbb0d4d4730dc47203efc0550a0ac0a0
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

logpolicy/logpolicy.go

@@ -627,7 +627,7 @@ func (opts Options) New() *Policy {
 		conf.IncludeProcSequence = true
 	}
 
-	if envknob.NoLogsNoSupport() || testenv.InTest() {
+	if envknob.NoLogsNoSupport() || testenv.InTest() || runtime.GOOS == "plan9" {
 		opts.Logf("You have disabled logging. Tailscale will not be able to provide support.")
 		conf.HTTPC = &http.Client{Transport: noopPretendSuccessTransport{}}
 	} else {

types/logger/logger.go

@@ -14,6 +14,7 @@ import (
 	"fmt"
 	"io"
 	"log"
+	"runtime"
 	"strings"
 	"sync"
 	"time"
@@ -162,6 +163,10 @@ func RateLimitedFnWithClock(logf Logf, f time.Duration, burst int, maxCache int,
 	if envknob.String("TS_DEBUG_LOG_RATE") == "all" {
 		return logf
 	}
+	if runtime.GOOS == "plan9" {
+		// To ease bring-up.
+		return logf
+	}
 	var (
 		mu       sync.Mutex
 		msgLim   = make(map[string]*limitData) // keyed by logf format