update check apache_requests

docs/20_Checks/check_apache_requests.md

@@ -2,13 +2,31 @@
 
 ## Introduction
 
+After requesting the apache servre status page you get 
+
+* the usage of available slots with number of available and used/ free slots
+* the number of used slots per slot type
+
+The check sends performance data for these data too.
+
+## Requirements
+
+* Apache httpd
+* enabled module mod_status
+* allow localhost to access /server-status
+
+## Syntax
+
+```txt
 ______________________________________________________________________
 
 CHECK_APACHE_REQUESTS
-v1.5
+v1.6
 
 (c) Institute for Medical Education - University of Bern
 Licence: GNU GPL 3
+
+https://os-docs.iml.unibe.ch/icinga-checks/Checks/check_apache_requests.html
 ______________________________________________________________________
 
 Get Apache httpd server-status page localhost/server-status.
@@ -26,21 +44,20 @@ slots) is greater 75% of available slots.
 You get an CRITICAL response if it is greater 90% of available slots.
 
 Slot types of apache httpd:
-    `_` Waiting for Connection, 
-    `S` Starting up, 
-    `R` Reading Request
-    `W` Sending Reply, 
-    `K` Keepalive (read), 
-    `D` DNS Lookup
-    `C` Closing connection, 
-    `L` Logging, 
-    `G` Gracefully finishing
-    `I` Idle cleanup of worker 
-    `.` Open slot with no current process
-
-## Syntax
-
-```txt
+    _ Waiting for Connection, 
+    S Starting up, 
+    R Reading Request
+    W Sending Reply, 
+    K Keepalive (read), 
+    D DNS Lookup
+    C Closing connection, 
+    L Logging, 
+    G Gracefully finishing
+    I Idle cleanup of worker 
+    . Open slot with no current process
+
+
+SYNTAX:
 check_apache_requests [-w WARN_LIMIT] [-c CRITICAL_LIMIT]
 
 OPTIONS:
@@ -53,6 +70,11 @@ OPTIONS:
 PARAMETERS:
 
     None.
+
+
+EXAMPLE:
+check_apache_requests -w 60 -c 80
+
 ```
 
 ## Examples