Icinga2: Add PluginDir for debian based systems

Author: tbauriedel

README.md

@@ -55,7 +55,7 @@ See [modules/base/collector.go](modules/base/collector.go) for details.
 Module: `icinga2`
 
 * Configuration from `/etc/icinga2`
-* Files in `/usr/lib64/nagios/plugins`
+* Files in PluginDir
 * Package information
 * Service status
 * Config check result

modules/icinga2/collector.go

@@ -12,7 +12,11 @@ const ModuleName = "icinga2"
 var files = []string{
 	"/etc/icinga2",
 	"/var/log/icinga2/icinga2.log",
+}
+
+var pluginFiles = []string{
 	"/usr/lib64/nagios/plugins",
+	"/usr/lib/nagios/plugins",
 }
 
 var optionalFiles = []string{
@@ -65,6 +69,7 @@ func Collect(c *collection.Collection) {
 	for _, file := range files {
 		c.AddFiles(ModuleName, file)
 	}
+	c.AddFilesAtLeastOne(ModuleName, pluginFiles...)
 
 	for _, file := range optionalFiles {
 		if _, err := os.Stat(file); err != nil {