Add Linux mdraid health monitoring (#1750)

agent/file_utils.go

@@ -0,0 +1,24 @@
+package agent
+
+import (
+	"os"
+	"strings"
+)
+
+func readStringFile(path string) string {
+	content, _ := readStringFileOK(path)
+	return content
+}
+
+func readStringFileOK(path string) (string, bool) {
+	b, err := os.ReadFile(path)
+	if err != nil {
+		return "", false
+	}
+	return strings.TrimSpace(string(b)), true
+}
+
+func fileExists(path string) bool {
+	_, err := os.Stat(path)
+	return err == nil
+}