fetch system overcommit_memory (#146)

Co-authored-by: Saeid Hassan-Abadi <[email protected]>

Author: Saeid-Abadi

modules/icingadb/collector.go

@@ -21,6 +21,7 @@ var files = []string{
 	"/etc/icingadb",
 	"/etc/icingadb-redis",
 	"/etc/icinga2/features-enabled/icingadb.conf",
+	"/proc/sys/vm/overcommit_memory",
 }
 
 var detailedFiles = []string{

modules/redis/collector.go

@@ -16,6 +16,7 @@ var relevantPaths = []string{
 
 var files = []string{
 	"/etc/redis*",
+	"/proc/sys/vm/overcommit_memory",
 }
 
 var optionalFiles = []string{