Doc: Troubleshooting: remove obsolete section "Analyze Notification Result"

This feature has been reverted and won't be re-introduced anytime soon.

doc/15-troubleshooting.md

@@ -950,95 +950,6 @@ curl -k -s -u root:icinga -H 'Accept: application/json' -X POST 'https://localho
 ```
 
 
-### Analyze Notification Result <a id="troubleshooting-notifications-result"></a>
-
-> **Note**
->
-> This feature is available since v2.11 and requires all endpoints
-> being updated.
-
-Notifications inside a HA enabled zone are balanced between the endpoints,
-just like checks.
-
-Sometimes notifications may fail, and with looking into the (debug) logs
-for both masters, you cannot correlate this correctly.
-
-The `last_notification_result` runtime attribute is stored and synced for Notification
-objects and can be queried via REST API.
-
-Example for retrieving the notification object and result from all `disk` services using a
-[regex match](18-library-reference.md#global-functions-regex) on the name:
-
-```
-$ curl -k -s -u root:icinga -H 'Accept: application/json' -H 'X-HTTP-Method-Override: GET' -X POST 'https://localhost:5665/v1/objects/notifications' \
--d '{ "filter": "regex(pattern, service.name)", "filter_vars": { "pattern": "^disk" }, "attrs": [ "__name", "last_notification_result" ], "pretty": true }'
-{
-    "results": [
-
-        {
-            "attrs": {
-                "last_notification_result": {
-                    "active": true,
-                    "command": [
-                        "/etc/icinga2/scripts/mail-service-notification.sh",
-                        "-4",
-                        "",
-                        "-6",
-                        "",
-                        "-b",
-                        "",
-                        "-c",
-                        "",
-                        "-d",
-                        "2019-08-02 10:54:16 +0200",
-                        "-e",
-                        "disk",
-                        "-l",
-                        "icinga2-agent1.localdomain",
-                        "-n",
-                        "icinga2-agent1.localdomain",
-                        "-o",
-                        "DISK OK - free space: / 38108 MB (90.84% inode=100%);",
-                        "-r",
-                        "user@localdomain",
-                        "-s",
-                        "OK",
-                        "-t",
-                        "RECOVERY",
-                        "-u",
-                        "disk"
-                    ],
-                    "execution_end": 1564736056.186217,
-                    "execution_endpoint": "icinga2-master1.localdomain",
-                    "execution_start": 1564736056.132323,
-                    "exit_status": 0.0,
-                    "output": "",
-                    "type": "NotificationResult"
-                }
-            },
-            "joins": {},
-            "meta": {},
-            "name": "icinga2-agent1.localdomain!disk!mail-service-notification",
-            "type": "Notification"
-        }
-
-...
-
-    ]
-}
-```
-
-Example with the debug console:
-
-```
-$ ICINGA2_API_PASSWORD=icinga icinga2 console --connect 'https://root@localhost:5665/' --eval 'get_object(Notification, "icinga2-agent1.localdomain!disk!mail-service-notification").last_notification_result.execution_endpoint' | jq
-
-"icinga2-agent1.localdomain"
-```
-
-Whenever a notification command failed to execute, you can fetch the output as well.
-
-
 ## Feature Troubleshooting <a id="troubleshooting-features"></a>
 
 ### Feature is not working <a id="feature-not-working"></a>