DOCS: Shoutrrr added list of notification services (#3242)

Co-authored-by: Tom Limoncelli <tlimoncelli@stackoverflow.com>

documentation/notifications.md

@@ -1,27 +1,22 @@
 # Notifications
 
-DNSControl has build in support for notifications when changes are made. This allows you to post messages in team chat, or send emails when dns changes are made.
+DNSControl's "notifications" feature will log `push` changes to other services in real time. Typically this is used to automatically announce DNS changes in a team chatroom.  The functionality is implemented using the open source [Shoutrrr](https://github.com/containrrr/shoutrrr) library, which knows how to communicate to many different systems.  Some additional services are provided natively, see the [notifications package](https://github.com/StackExchange/dnscontrol/tree/main/pkg/notifications).
-
-Notifications are written in the [notifications package](https://github.com/StackExchange/dnscontrol/tree/main/pkg/notifications), and is a really simple interface to implement if you want to add
-new types or destinations.
 
 ## Configuration
 
-Notifications are set up in your credentials JSON file. They will use the `notifications` key to look for keys or configuration needed for various notification types.
+Notifications are configured in the `creds.json` file, since they often contain API keys or other secrets. The `notifications` key lists the notification service and options.
 
 {% code title="creds.json" %}
 ```json
-  "r53": {
+{
-      ...
+  "r53": {},
-    },
+  "gcloud": {},
-  "gcloud": {
-        ...
-  } ,
   "notifications": {
     "slack_url": "https://api.slack.com/apps/0XXX0X0XX0/incoming-webhooks",
     "teams_url": "https://outlook.office.com/webhook/00000000-0000-0000-0000-000000000000@00000000-0000-0000-0000-000000000000/IncomingWebhook/00000000000000000000000000000000/00000000-0000-0000-0000-000000000000",
     "shoutrrr_url": "discover://token@id"
   }
+}
 ```
 {% endcode %}
 
@@ -67,25 +62,62 @@ dnscontrol push --notify
 Successfully ran correction for **example.com[my_provider]** - CREATE foo.example.com A 1.2.3.4 ttl=86400
 ```
 
-## Notification types
+## Notification services
+
+### Shoutrrr
+
+DNSControl supports various notification methods via Shoutrrr, including email (SMTP), Discord, Pushover, and many others. For detailed setup instructions, click on the desired service:
+
+* [Bark](https://containrrr.dev/shoutrrr/latest/services/bark/)
+* [Discord](https://containrrr.dev/shoutrrr/latest/services/discord/)
+* [Email](https://containrrr.dev/shoutrrr/latest/services/email/)
+* [Google Chat](https://containrrr.dev/shoutrrr/latest/services/googlechat/)
+* [Gotify](https://containrrr.dev/shoutrrr/latest/services/gotify/)
+* [IFTTT](https://containrrr.dev/shoutrrr/latest/services/ifttt/)
+* [Join](https://containrrr.dev/shoutrrr/latest/services/join/)
+* [Matrix](https://containrrr.dev/shoutrrr/latest/services/matrix/)
+* [Mattermost](https://containrrr.dev/shoutrrr/latest/services/mattermost/)
+* [Ntfy](https://containrrr.dev/shoutrrr/latest/services/ntfy/)
+* [OpsGenie](https://containrrr.dev/shoutrrr/latest/services/opsgenie/)
+* [Pushbullet](https://containrrr.dev/shoutrrr/latest/services/pushbullet/)
+* [Pushover](https://containrrr.dev/shoutrrr/latest/services/pushover/)
+* [Rocketchat](https://containrrr.dev/shoutrrr/latest/services/rocketchat/)
+* [Slack](https://containrrr.dev/shoutrrr/latest/services/slack/)
+* [Teams](https://containrrr.dev/shoutrrr/latest/services/teams/)
+* [Telegram](https://containrrr.dev/shoutrrr/latest/services/telegram/)
+* [Zulip Chat](https://containrrr.dev/shoutrrr/latest/services/zulip/)
+
+The above list is accurate as of 2024-Dec. The compete list and all configuration details are in the [Shoutrrr documentation](https://containrrr.dev/shoutrrr/latest/services/overview/).
+
+Configure `shoutrrr_url` with the Shoutrrr URL to be notified.
+
+{% code title="creds.json" %}
+```json
+{
+  "notifications": {
+    "shoutrrr_url": "discover://token@id"
+  }
+}
+```
+{% endcode %}
 
 ### Slack/Mattermost
 
-If you want to use the Slack integration, you need to create a webhook in Slack.
+To use the Slack integration, you need to create a webhook in Slack.
-Please see the [Slack documentation](https://api.slack.com/messaging/webhooks) or the [Mattermost documentation](https://developers.mattermost.com/integrate/webhooks/incoming/)
+Please see the [Slack documentation](https://api.slack.com/messaging/webhooks) or the [Mattermost documentation](https://docs.mattermost.com/developer/webhooks-incoming.html)
 
 Configure `slack_url` to this webhook. Mattermost works as well, as they share the same api,
 
 ### Microsoft Teams
 
-If you want to use the Teams integration, you need to create a webhook in Teams.
+To use the Teams integration, you need to create a webhook in Teams.
 Please see the [Teams documentation](https://docs.microsoft.com/en-us/microsoftteams/platform/webhooks-and-connectors/how-to/add-incoming-webhook#add-an-incoming-webhook-to-a-teams-channel)
 
 Configure `teams_url` to this webhook.
 
 ### Telegram
 
-If you want to use the [Telegram](https://telegram.org/) integration, you need to create a Telegram bot and obtain a Bot Token, as well as a Chat ID. Get a Bot Token by contacting [@BotFather](https://telegram.me/botfather), and a Chat ID by contacting [@myidbot](https://telegram.me/myidbot).
+To use the [Telegram](https://telegram.org/) integration, you need to create a Telegram bot and obtain a Bot Token, as well as a Chat ID. Get a Bot Token by contacting [@BotFather](https://telegram.me/botfather), and a Chat ID by contacting [@myidbot](https://telegram.me/myidbot).
 
 Configure `telegram_bot_token` and `telegram_chat_id` to these values.
 
@@ -94,19 +126,3 @@ Configure `telegram_bot_token` and `telegram_chat_id` to these values.
 This is Stack Overflow's built in chat system. This is probably not useful for most people.
 
 Configure `bonfire_url` to be the full url including room and api key.
-
-### Shoutrrr (email, Discord, Pushover, etc.)
-
-DNSControl can use many other notification methods via Shoutrrr, such as email (SMTP), Discord, Pushover and others. See the [Shoutrrr documentation](https://containrrr.dev/shoutrrr/latest/services/overview/) for a list of supported methods and configuration instructions.
-
-Configure `shoutrrr_url` with the Shoutrrr URL to be notified.
-
-## Future work
-
-Yes, this seems pretty limited right now in what it can do. We didn't want to add a bunch of notification types if nobody was going to use them. The good news is, it should
-be really simple to add more. We gladly welcome any PRs with new notification destinations. Some easy possibilities:
-
-- Email
-- Generic Webhooks
-
-Please update this documentation if you add anything.