Merging upstream version 1.29.0.

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

3 files changed, 367 insertions, 0 deletions

diff --git a/docs/monitor/configure-alarms.md b/docs/monitor/configure-alarms.md
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+<!--
+title: "Configure health alarms"
+description: "Netdata's health monitoring watchdog is incredibly adaptable to your infrastructure's unique needs, with configurable health alarms."
+custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/monitor/configure-alarms.md
+-->
+
+# Configure health alarms
+
+Netdata's health watchdog is highly configurable, with support for dynamic thresholds, hysteresis, alarm templates, and
+more. You can tweak any of the existing alarms based on your infrastructure's topology or specific monitoring needs, or
+create new entities.
+
+You can use health alarms in conjunction with any of Netdata's [collectors](/docs/collect/how-collectors-work.md) (see
+the [supported collector list](/collectors/COLLECTORS.md)) to monitor the health of your systems, containers, and
+applications in real time.
+
+While you can see active alarms both on the local dashboard and Netdata Cloud, all health alarms are configured _per
+node_ via individual Netdata Agents. If you want to deploy a new alarm across your
+[infrastructure](/docs/quickstart/infrastructure.md), you must configure each node with the same health configuration
+files.
+
+## Edit health configuration files
+
+All of Netdata's [health configuration files](/health/REFERENCE.md#health-configuration-files) are in Netdata's config
+directory, inside the `health.d/` directory. Navigate to your [Netdata config directory](/docs/configure/nodes.md) and
+use `edit-config` to make changes to any of these files.
+
+For example, to edit the `cpu.conf` health configuration file, run:
+
+```bash
+sudo ./edit-config health.d/cpu.conf
+```
+
+Each health configuration file contains one or more health _entities_, which always begin with `alarm:` or `template:`.
+For example, here is the first health entity in `health.d/cpu.conf`:
+
+```yaml
+template: 10min_cpu_usage
+      on: system.cpu
+      os: linux
+   hosts: *
+  lookup: average -10m unaligned of user,system,softirq,irq,guest
+   units: %
+   every: 1m
+    warn: $this > (($status >= $WARNING)  ? (75) : (85))
+    crit: $this > (($status == $CRITICAL) ? (85) : (95))
+   delay: down 15m multiplier 1.5 max 1h
+    info: average cpu utilization for the last 10 minutes (excluding iowait, nice and steal)
+      to: sysadmin
+```
+
+To tune this alarm to trigger warning and critical alarms at a lower CPU utilization, change the `warn` and `crit` lines
+to the values of your choosing. For example:
+
+```yaml
+    warn: $this > (($status >= $WARNING)  ? (60) : (75))
+    crit: $this > (($status == $CRITICAL) ? (75) : (85))
+```
+
+Save the file and [reload Netdata's health configuration](#reload-health-configuration) to make your changes live.
+
+### Silence an individual alarm
+
+Instead of disabling an alarm altogether, or even disabling _all_ alarms, you can silence individual alarms by changing
+one line in a given health entity. To silence any single alarm, change the `to:` line in its entity to `silent`.
+
+```yaml
+      to: silent
+```
+
+## Write a new health entity
+
+While tuning existing alarms may work in some cases, you may need to write entirely new health entities based on how
+your systems, containers, and applications work.
+
+Read Netdata's [health reference](/health/REFERENCE.md#health-entity-reference) for a full listing of the format,
+syntax, and functionality of health entities.
+
+To write a new health entity into a new file, navigate to your [Netdata config directory](/docs/configure/nodes.md),
+then use `touch` to create a new file in the `health.d/` directory. Use `edit-config` to start editing the file.
+
+As an example, let's create a `ram-usage.conf` file.
+
+```bash
+sudo touch health.d/ram-usage.conf
+sudo ./edit-config health.d/ram-usage.conf
+```
+
+For example, here is a health entity that triggers a warning alarm when a node's RAM usage rises above 80%, and a
+critical alarm above 90%:
+
+```yaml
+ alarm: ram_usage
+    on: system.ram
+lookup: average -1m percentage of used
+ units: %
+ every: 1m
+  warn: $this > 80
+  crit: $this > 90
+  info: The percentage of RAM being used by the system.
+```
+
+Let's look into each of the lines to see how they create a working health entity.
+
+-   `alarm`: The name for your new entity. The name needs to follow these requirements:
+    -   Any alphabet letter or number.
+    -   The symbols `.` and `_`.
+    -   Cannot be `chart name`, `dimension name`, `family name`, or `chart variable names`.  
+-   `on`: Which chart the entity listens to.
+-   `lookup`: Which metrics the alarm monitors, the duration of time to monitor, and how to process the metrics into a
+    usable format.
+    -   `average`: Calculate the average of all the metrics collected.
+    -   `-1m`: Use metrics from 1 minute ago until now to calculate that average.
+    -   `percentage`: Clarify that we're calculating a percentage of RAM usage.
+    -   `of used`: Specify which dimension (`used`) on the `system.ram` chart you want to monitor with this entity.
+-   `units`: Use percentages rather than absolute units.
+-   `every`: How often to perform the `lookup` calculation to decide whether or not to trigger this alarm.
+-   `warn`/`crit`: The value at which Netdata should trigger a warning or critical alarm. This example uses simple
+    syntax, but most pre-configured health entities use
+    [hysteresis](/health/REFERENCE.md#special-usage-of-the-conditional-operator) to avoid superfluous notifications.
+-   `info`: A description of the alarm, which will appear in the dashboard and notifications.
+
+In human-readable format: 
+
+> This health entity, named **ram_usage**, watches the **system.ram** chart. It looks up the last **1 minute** of
+> metrics from the **used** dimension and calculates the **average** of all those metrics in a **percentage** format,
+> using a **% unit**. The entity performs this lookup **every minute**. 
+> 
+> If the average RAM usage percentage over the last 1 minute is **more than 80%**, the entity triggers a warning alarm.
+> If the usage is **more than 90%**, the entity triggers a critical alarm.
+
+When you finish writing this new health entity, [reload Netdata's health configuration](#reload-health-configuration) to
+see it live on the local dashboard or Netdata Cloud.
+
+## Reload health configuration
+
+To make any changes to your health configuration live, you must reload Netdata's health monitoring system. To do that
+without restarting all of Netdata, run `netdatacli reload-health` or `killall -USR2 netdata`.
+
+## What's next?
+
+With your health entities configured properly, it's time to [enable
+notifications](/docs/monitor/enable-notifications.md) to get notified whenever a node reaches a warning or critical
+state.
+
+To build complex, dynamic alarms, read our guide on [dimension templates](/docs/guides/monitor/dimension-templates.md).
+
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fdocs%2Fmonitor%2Fview-active-alarms&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)](<>)
diff --git a/docs/monitor/enable-notifications.md b/docs/monitor/enable-notifications.md
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+<!--
+title: "Enable alarm notifications"
+description: "Send Netdata alarms from a centralized place with Netdata Cloud, or configure nodes individually, to enable incident response and faster resolution."
+custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/monitor/enable-notifications.md
+-->
+
+# Enable alarm notifications
+
+Netdata offers two ways to receive alarm notifications on external platforms. These methods work independently _or_ in
+parallel, which means you can enable both at the same time to send alarm notifications to any number of endpoints.
+
+Both methods use a node's health alarms to generate the content of alarm notifications. Read the doc on [configuring
+alarms](/docs/monitor/configure-alarms.md) to change the preconfigured thresholds or to create tailored alarms for your
+infrastructure.
+
+Netdata Cloud offers [centralized alarm notifications](#netdata-cloud) via email, which leverages the health status
+information already streamed to Netdata Cloud from claimed nodes to send notifications to those who have enabled them.
+
+The Netdata Agent has a [notification system](#netdata-agent) that supports more than a dozen services, such as email,
+Slack, PagerDuty, Twilio, Amazon SNS, Discord, and much more.
+
+For example, use centralized alarm notifications in Netdata Cloud for immediate, zero-configuration alarm notifications
+for your team, then configure individual nodes send notifications to a PagerDuty endpoint for an automated incident
+response process.
+
+## Netdata Cloud
+
+Netdata Cloud's [centralized alarm notifications](https://learn.netdata.cloud/docs/cloud/monitoring/notifications/) is a
+zero-configuration way to get notified when an anomaly or incident strikes any node or application in your
+infrastructure. The advantage of using centralized alarm notifications from Netdata Cloud is that you don't have to
+worry about configuring each node in your infrastructure.
+
+To enable centralized alarm notifications for a Space, click on **Manage Space** in the left-hand menu, then click on
+the **Notifications** tab. Click the toggle switch next to **E-mail** to enable this notification method.
+
+Next, enable notifications on a user level by clicking on your profile icon, then **Profile** in the dropdown. The
+**Notifications** tab reveals rich management settings, including the ability to enable/disable methods entirely or
+choose what types of notifications to receive from each War Room.
+
+![Enabling and configuring alarm notifications in Netdata
+Cloud](https://user-images.githubusercontent.com/1153921/101936280-93c50900-3b9d-11eb-9ba0-d6927fa872b7.gif)
+
+See the [centralized alarm notifications](https://learn.netdata.cloud/docs/cloud/monitoring/notifications/) reference
+doc for further details about what information is conveyed in an email notification, flood protection, and more.
+
+## Netdata Agent
+
+The Netdata Agent's [notification system](/health/notifications/README.md) runs on every node and dispatches
+notifications based on configured endpoints and roles. You can enable multiple endpoints on any one node _and_ use Agent
+notifications in parallel with centralized alarm notifications in Netdata Cloud.
+
+> ❗ If you want to enable notifications from multiple nodes in your infrastructure, each running the Netdata Agent, you
+> must configure each node individually.
+
+Below, we'll use [Slack notifications](#enable-slack-notifications) as an example of the process of enabling any
+notification platform.
+
+### Supported notification endpoints
+
+-   [**alerta.io**](/health/notifications/alerta/README.md)
+-   [**Amazon SNS**](/health/notifications/awssns/README.md)
+-   [**Custom endpoint**](/health/notifications/custom/README.md)
+-   [**Discord**](/health/notifications/discord/README.md)
+-   [**Dynatrace**](/health/notifications/dynatrace/README.md)
+-   [**Email**](/health/notifications/email/README.md)
+-   [**Flock**](/health/notifications/flock/README.md)
+-   [**Google Hangouts**](/health/notifications/hangouts/README.md)
+-   [**IRC**](/health/notifications/irc/README.md)
+-   [**Kavenegar**](/health/notifications/kavenegar/README.md)
+-   [**Matrix**](/health/notifications/matrix/README.md)
+-   [**Messagebird**](/health/notifications/messagebird/README.md)
+-   [**Netdata Agent dashboard**](/health/notifications/web/README.md)
+-   [**Opsgenie**](/health/notifications/opsgenie/README.md)
+-   [**PagerDuty**](/health/notifications/pagerduty/README.md)
+-   [**Prowl**](/health/notifications/prowl/README.md)
+-   [**PushBullet**](/health/notifications/pushbullet/README.md)
+-   [**PushOver**](/health/notifications/pushover/README.md)
+-   [**Rocket.Chat**](/health/notifications/rocketchat/README.md)
+-   [**Slack**](/health/notifications/slack/README.md)
+-   [**SMS Server Tools 3**](/health/notifications/smstools3/README.md)
+-   [**StackPulse**](/health/notifications/stackpulse/README.md)
+-   [**Syslog**](/health/notifications/syslog/README.md)
+-   [**Telegram**](/health/notifications/telegram/README.md)
+-   [**Twilio**](/health/notifications/twilio/README.md)
+
+### Enable Slack notifications
+
+First, [Add an incoming webhook](https://slack.com/apps/A0F7XDUAZ-incoming-webhooks) in Slack for the channel where you
+want to see alarm notifications from Netdata. Click the green **Add to Slack** button, choose the channel, and click the
+**Add Incoming WebHooks Integration** button.
+
+On the following page, you'll receive a **Webhook URL**. That's what you'll need to configure Netdata, so keep it handy.
+
+Navigate to your [Netdata config directory](/docs/configure/nodes.md#netdata-config-directory) and use `edit-config` to
+open the `health_alarm_notify.conf` file:
+
+```bash
+sudo ./edit-config health_alarm_notify.conf
+```
+
+Look for the `SLACK_WEBHOOK_URL="  "` line and add the incoming webhook URL you got from Slack:
+
+```conf
+SLACK_WEBHOOK_URL="https://hooks.slack.com/services/XXXXXXXXX/XXXXXXXXX/XXXXXXXXXXXX"
+```
+
+A few lines down, edit the `DEFAULT_RECIPIENT_SLACK` line to contain a single hash `#` character. This instructs Netdata
+to send a notification to the channel you configured with the incoming webhook.
+
+```conf
+DEFAULT_RECIPIENT_SLACK="#"
+```
+
+To test Slack notifications, switch to the Netdata user.
+
+```bash
+sudo su -s /bin/bash netdata
+```
+
+Next, run the `alarm-notify` script using the `test` option.
+
+```bash
+/usr/libexec/netdata/plugins.d/alarm-notify.sh test
+```
+
+You should receive three notifications in your Slack channel for each health status change: `WARNING`, `CRITICAL`, and
+`CLEAR`.
+
+See the [Agent Slack notifications](/health/notifications/slack/README.md) doc for more options and information.
+
+## What's next?
+
+Now that you have health entities configured to your infrastructure's needs and notifications to inform you of anomalies
+or incidents, your health monitoring setup is complete.
+
+To make your dashboards most useful during root cause analysis, use Netdata's [distributed data
+architecture](/docs/store/distributed-data-architecture.md) for the best-in-class performance and scalability.
+
+### Related reference documentation
+
+- [Netdata Cloud · Alarm notifications](https://learn.netdata.cloud/docs/cloud/monitoring/notifications/)
+- [Netdata Agent · Notifications](/health/notifications/README.md)
+
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fdocs%2Fmonitor%2Fenable-notifications&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)](<>)
diff --git a/docs/monitor/view-active-alarms.md b/docs/monitor/view-active-alarms.md
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+<!--
+title: "View active health alarms"
+description: "View active alarms and their rich data to discover and resolve anomalies and performance issues across your infrastructure."
+custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/monitor/view-active-alarms.md
+-->
+
+# View active health alarms
+
+Every Netdata Agent comes with hundreds of pre-installed health alarms designed to notify you when an anomaly or
+performance issue affects your node or the applications it runs.
+
+As soon as you launch a Netdata Agent and [claim it](/docs/get/README.md#claim-your-node-on-netdata-cloud), you can view
+active alarms in both the local dashboard and Netdata Cloud.
+
+## View active alarms in Netdata Cloud
+
+You can see active alarms from any node in your infrastructure in two ways: Click on the bell 🔔 icon in the top
+navigation, or click on the first column of any node's row in Nodes. This column's color changes based on the node's
+[health status](/health/REFERENCE.md#alarm-statuses): gray is `CLEAR`, yellow is `WARNING`, and red is `CRITICAL`.
+
+![The Alarms panel in Netdata
+Cloud](https://user-images.githubusercontent.com/1153921/93541137-70761f00-f90a-11ea-89ef-7948c6213200.png)
+
+The Alarms panel lists all active alarms for nodes within that War Room, and tells you which chart triggered the alarm,
+what that chart's current value is, the alarm that triggered it, and when the alarm status first began.
+
+Use the input field in the Alarms panel to filter active alarms. You can sort by the node's name, alarm, status, chart
+that triggered the alarm, or the operating system. Read more about the [filtering
+syntax](https://learn.netdata.cloud/docs/cloud/war-rooms#node-filter) to build valuable filters for your infrastructure.
+
+Click on the 3-dot icon (`⋮`) to view active alarm information or navigate directly to the offending chart in that
+node's Cloud dashboard with the **Go to chart** button.
+
+The active alarm information gives you details about the alarm that's been triggered. You can see the alarm's
+configuration, how it calculates warning or critical alarms, and which configuration file you could edit on that node if
+you want to tweak or disable the alarm to better suit your needs.
+
+![Screenshot from 2020-09-17
+17-21-29](https://user-images.githubusercontent.com/1153921/93541139-710eb580-f90a-11ea-809d-25afe1270108.png)
+
+## View active alarms in the Netdata Agent
+
+Find the bell 🔔 icon in the top navigation to bring up a modal that shows currently raised alarms, all running alarms,
+and the alarms log. Here is an example of a raised `system.cpu` alarm, followed by the full list and alarm log:
+
+![Animated GIF of looking at raised alarms and the alarm
+log](https://user-images.githubusercontent.com/1153921/80842482-8c289500-8bb6-11ea-9791-600cfdbe82ce.gif)
+
+And a static screenshot of the raised CPU alarm: 
+
+![Screenshot of a raised system CPU
+alarm](https://user-images.githubusercontent.com/1153921/80842330-2dfbb200-8bb6-11ea-8147-3cd366eb0f37.png)
+
+The alarm itself is named **system - cpu**, and its context is `system.cpu`. Beneath that is an auto-updating badge that
+shows the latest value of the chart that triggered the alarm.
+
+With the three icons beneath that and the **role** designation, you can:
+
+1.  Scroll to the chart associated with this raised alarm.
+2.  Copy a link to the badge to your clipboard.
+3.  Copy the code to embed the badge onto another web page using an `<embed>` element.
+
+The table on the right-hand side displays information about the health entity that triggered the alarm, which you can
+use as a reference to [configure alarms](/docs/monitor/configure-alarms.md).
+
+## What's next?
+
+With the information that appears on Netdata Cloud and the local dashboard about active alarms, you can [configure
+alarms](/docs/monitor/configure-alarms.md) to match your infrastructure's needs or your team's goals.
+
+If you're happy with the pre-configured alarms, skip ahead to [enable
+notifications](/docs/monitor/enable-notifications.md) to use Netdata Cloud's centralized alarm notifications and/or
+per-node notifications to endpoints like Slack, PagerDuty, Twilio, and more.
+
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fdocs%2Fmonitor%2Fview-active-alarms&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)](<>)