Move --eventlog-endpoint out of isolateFlags.

client/cmd/isolate/common.go

Index: client/cmd/isolate/common.go
diff --git a/client/cmd/isolate/common.go b/client/cmd/isolate/common.go
index 5137f8047714ec2354102eba2cf995bfae5ceb07..ba0da5b712177523bea62a8b9bfa0ef0a3b8b802 100644
--- a/client/cmd/isolate/common.go
+++ b/client/cmd/isolate/common.go
@@ -71,7 +71,6 @@ func (c *commonServerFlags) createAuthClient() (*http.Client, error) {
 type isolateFlags struct {
 	// TODO(tandrii): move ArchiveOptions from isolate pkg to here.
 	isolate.ArchiveOptions
-	EventlogEndpoint string
 }
 
 func (c *isolateFlags) Init(f *flag.FlagSet) {
@@ -84,8 +83,6 @@ func (c *isolateFlags) Init(f *flag.FlagSet) {
 	f.Var(&c.ConfigVariables, "config-variable", "Config variables are used to determine which conditions should be matched when loading a .isolate file, default: [].")
 	f.Var(&c.PathVariables, "path-variable", "Path variables are used to replace file paths when loading a .isolate file, default: {}")
 	f.Var(&c.ExtraVariables, "extra-variable", "Extraneous variables are replaced on the command entry and on paths in the .isolate file but are not considered relative paths.")
-
-	f.StringVar(&c.EventlogEndpoint, "eventlog-endpoint", "", `The URL destination for eventlogs. The special values "prod" or "test" may be used to target the standard prod or test urls repspectively. An empty string disables eventlogging.`)
 }
 
 // RequiredIsolateFlags specifies which flags are required on the command line
@@ -132,3 +129,12 @@ func (c *isolateFlags) Parse(cwd string, flags RequiredIsolateFlags) error {
 	}
 	return nil
 }
+
+// loggingFlags configures eventlog logging.
+type loggingFlags struct {
+	EventlogEndpoint string
+}
+
+func (lf *loggingFlags) Init(f *flag.FlagSet) {
+	f.StringVar(&lf.EventlogEndpoint, "eventlog-endpoint", "", `The URL destination for eventlogs. The special values "prod" or "test" may be used to target the standard prod or test urls repspectively. An empty string disables eventlogging.`)
+}