Merge pull request #50553 from m1093782566/fed-kube-apiserver

Automatic merge from submit-queue (batch tested with PRs 49129, 50436, 50417, 50553, 47587)

add validation for fed-apiserver and apiserver run options

**What this PR does / why we need it**:

Add validation for fed-apiserver and apiserver run options

**Which issue this PR fixes** 

fixes #50552

**Special notes for your reviewer**:

This is a follow-up of #50135

**Release note**:

```release-note
NONE
```

federation/cmd/federation-apiserver/app/options/validation.go

@@ -20,6 +20,9 @@ import "fmt"
 
 func (options *ServerRunOptions) Validate() []error {
 	var errors []error
+	if errs := options.GenericServerRunOptions.Validate(); len(errs) > 0 {
+		errors = append(errors, errs...)
+	}
 	if errs := options.Etcd.Validate(); len(errs) > 0 {
 		errors = append(errors, errs...)
 	}

staging/src/k8s.io/apiserver/pkg/server/options/server_run_options.go

@@ -83,6 +83,22 @@ func (s *ServerRunOptions) DefaultAdvertiseAddress(secure *SecureServingOptions)
 	return nil
 }
 
+// Validate checks validation of ServerRunOptions
+func (s *ServerRunOptions) Validate() []error {
+	errors := []error{}
+	if s.TargetRAMMB < 0 {
+		errors = append(errors, fmt.Errorf("--target-ram-mb can not be negative value"))
+	}
+	if s.MaxRequestsInFlight < 0 {
+		errors = append(errors, fmt.Errorf("--max-requests-inflight can not be negative value"))
+	}
+	if s.MaxMutatingRequestsInFlight < 0 {
+		errors = append(errors, fmt.Errorf("--min-request-timeout can not be negative value"))
+	}
+
+	return errors
+}
+
 // AddFlags adds flags for a specific APIServer to the specified FlagSet
 func (s *ServerRunOptions) AddUniversalFlags(fs *pflag.FlagSet) {
 	// Note: the weird ""+ in below lines seems to be the only way to get gofmt to