update doc page

docs/20_Checks/check_couchdb.md

@@ -18,7 +18,7 @@ Check couchdb status.
 ______________________________________________________________________
 
 CHECK_COUCHDB
-v0.4
+v0.5
 
 (c) Institute for Medical Education - University of Bern
 Licence: GNU GPL 3
@@ -42,6 +42,8 @@ OPTIONS:
   up              show general couchdb status
   replication     show last replication status
   pending         show count of pending updates for nodes, dbs and users
+  open_databases  show number of open databases
+  open_os_files   show number of file descriptors CouchDB has open
 
 EXAMPLE:
 check_couchdb -m up
@@ -164,3 +166,41 @@ Reponse: of /_up
   }
 }
 ```
+
+### open_databases
+
+Show number of open databases
+
+This check sends performance data.
+
+``check_couchdb -m open_databases`` returns
+
+```txt
+OK: Couchdb :: open_databases = 0
+Reponse: of /_node/_local/_stats/couchdb/open_databases
+{
+  "value": 0,
+  "type": "counter",
+  "desc": "number of open databases"
+}
+ |opendatabases=0;; 
+```
+
+### open_os_files
+
+Show number of file descriptors CouchDB has open
+
+This check sends performance data.
+
+``check_couchdb -m open_os_files`` returns
+
+```txt
+OK: Couchdb :: open_os_files = 0
+Reponse: of /_node/_local/_stats/couchdb/open_os_files
+{
+  "value": 0,
+  "type": "counter",
+  "desc": "number of file descriptors CouchDB has open"
+}
+ |openosfiles=0;; 
+```