runtime: add new command to collect metrics from Kata containers

Add a new command to collect metrics and return metrics to Prometheus.

Signed-off-by: bin liu <bin@hyper.sh>

src/runtime/pkg/utils/utils.go

@@ -1,10 +1,12 @@
+// Copyright (c) 2020 Ant Financial
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
 package utils
 
 import (
-	"fmt"
 	"net/http"
-	"os"
-	"path/filepath"
 	"strings"
 )
 
@@ -29,14 +31,3 @@ func GzipAccepted(header http.Header) bool {
 func String2Pointer(s string) *string {
 	return &s
 }
-
-// EnsureFileDir will check if file a in an absolute format and ensure the directory is exits
-// if not, make the dir like `mkdir -p`
-func EnsureFileDir(file string) error {
-	if !filepath.IsAbs(file) {
-		return fmt.Errorf("file must be an absolute path")
-	}
-
-	path := filepath.Dir(file)
-	return os.MkdirAll(path, 0755)
-}