Merging upstream version 1.46.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+<!--startmeta
+custom_edit_url: "https://github.com/netdata/netdata/edit/master/src/health/notifications/slack/README.md"
+meta_yaml: "https://github.com/netdata/netdata/edit/master/src/health/notifications/slack/metadata.yaml"
+sidebar_label: "Slack"
+learn_status: "Published"
+learn_rel_path: "Alerts & Notifications/Notifications/Agent Dispatched Notifications"
+message: "DO NOT EDIT THIS FILE DIRECTLY, IT IS GENERATED BY THE NOTIFICATION'S metadata.yaml FILE"
+endmeta-->
+
+# Slack
+
+
+<img src="https://netdata.cloud/img/slack.png" width="150"/>
+
+
+Send notifications to a Slack workspace using Netdata's Agent alert notification feature, which supports dozens of endpoints, user roles, and more.
+
+
+
+<img src="https://img.shields.io/badge/maintained%20by-Netdata-%2300ab44" />
+
+## Setup
+
+### Prerequisites
+
+#### 
+
+- Slack app along with an incoming webhook, read Slack's guide on the topic [here](https://api.slack.com/messaging/webhooks).
+- One or more channels to post the messages to
+- Access to the terminal where Netdata Agent is running
+
+
+
+### Configuration
+
+#### File
+
+The configuration file name for this integration is `health_alarm_notify.conf`.
+
+
+You can edit the configuration file using the `edit-config` script from the
+Netdata [config directory](/docs/netdata-agent/configuration/README.md#the-netdata-config-directory).
+
+```bash
+cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
+sudo ./edit-config health_alarm_notify.conf
+```
+#### Options
+
+The following options can be defined for this notification
+
+<details open><summary>Config Options</summary>
+
+| Name | Description | Default | Required |
+|:----|:-----------|:-------|:--------:|
+| SEND_SLACK | Set `SEND_SLACK` to YES | YES | yes |
+| SLACK_WEBHOOK_URL | set `SLACK_WEBHOOK_URL` to your Slack app's webhook URL. |  | yes |
+| DEFAULT_RECIPIENT_SLACK | Set `DEFAULT_RECIPIENT_SLACK` to the Slack channel your Slack app is set to send messages to. The syntax for channels is `#channel` or `channel`. |  | yes |
+
+</details>
+
+#### Examples
+
+##### Basic Configuration
+
+
+
+```yaml
+#------------------------------------------------------------------------------
+# slack (slack.com) global notification options
+
+SEND_SLACK="YES"
+SLACK_WEBHOOK_URL="https://hooks.slack.com/services/XXXXXXXX/XXXXXXXX/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" 
+DEFAULT_RECIPIENT_SLACK="#alarms"
+
+```
+
+
+## Troubleshooting
+
+### Test Notification
+
+You can run the following command by hand, to test alerts configuration:
+
+```bash
+# become user netdata
+sudo su -s /bin/bash netdata
+
+# enable debugging info on the console
+export NETDATA_ALARM_NOTIFY_DEBUG=1
+
+# send test alarms to sysadmin
+/usr/libexec/netdata/plugins.d/alarm-notify.sh test
+
+# send test alarms to any role
+/usr/libexec/netdata/plugins.d/alarm-notify.sh test "ROLE"
+```
+
+Note that this will test _all_ alert mechanisms for the selected role.
+
+