log: improve Event benchmark to check redactability as well

More CPU and a slightly different allocation profile, though the
allocations are largely driven by the arguments passed to `Eventf` and
they are trivial in this benchmark.

```
go test ./pkg/util/log -run - -bench BenchmarkEvent -benchtime 3s
goos: linux
goarch: amd64
pkg: github.com/cockroachdb/cockroach/pkg/util/log
cpu: AMD Ryzen 7 3800X 8-Core Processor
BenchmarkEventf_WithVerboseTraceSpan/redactable=false-16   759444  4903 ns/op  961 B/op   18 allocs/op
BenchmarkEventf_WithVerboseTraceSpan/redactable=true-16    561772  6831 ns/op  1081 B/op  16 allocs/op
```

Release note: None

pkg/util/log/clog_test.go

@@ -770,15 +770,20 @@ func BenchmarkLogEntry_String(b *testing.B) {
 }
 
 func BenchmarkEventf_WithVerboseTraceSpan(b *testing.B) {
- b.ReportAllocs()
- tagbuf := logtags.SingleTagBuffer("hello", "there")
- ctx := logtags.WithTags(context.Background(), tagbuf)
- tracer := tracing.NewTracer()
- ctx, sp := tracer.StartSpanCtx(ctx, "benchspan", tracing.WithForceRealSpan())
- b.ResetTimer()
- defer sp.Finish()
- sp.SetVerbose(true)
- for i := 0; i < b.N; i++ {
- Eventf(ctx, "%s %s %s", "foo", "bar", "baz")
+ for _, redactable := range []bool{false, true} {
+ b.Run(fmt.Sprintf("redactable=%t", redactable), func(b *testing.B) {
+ b.ReportAllocs()
+ tagbuf := logtags.SingleTagBuffer("hello", "there")
+ ctx := logtags.WithTags(context.Background(), tagbuf)
+ tracer := tracing.NewTracer()
+ tracer.SetRedactable(redactable)
+ ctx, sp := tracer.StartSpanCtx(ctx, "benchspan", tracing.WithForceRealSpan())
+ defer sp.Finish()
+ b.ResetTimer()
+ sp.SetVerbose(true)
+ for i := 0; i < b.N; i++ {
+ Eventf(ctx, "%s %s %s", "foo", "bar", "baz")
+ }
+ })
  }
 }