Reorg learn 021723 (#14556)

* Change titles of agent alert notifications

* Reintroduce netdata for iot

* Eliminate guides category, merge health config docs

* Rename setup to configuration

* Codacy fixes and move health config reference

62 files changed, 390 insertions, 1208 deletions

diff --git a/aclk/README.md b/aclk/README.md
index f4149eef4c..fc39032552 100644
--- a/aclk/README.md
+++ b/aclk/README.md
@@ -6,7 +6,7 @@ custom_edit_url: "https://github.com/netdata/netdata/edit/master/aclk/README.md"
 sidebar_label: "Agent-Cloud link (ACLK)"
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Setup"
+learn_rel_path: "Configuration"
 -->
 
 # Agent-cloud link (ACLK)
diff --git a/claim/README.md b/claim/README.md
index 50591c9071..85c438210d 100644
--- a/claim/README.md
+++ b/claim/README.md
@@ -5,7 +5,7 @@ custom_edit_url: "https://github.com/netdata/netdata/edit/master/claim/README.md
 sidebar_label: "Connect Agent to Cloud"
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Setup"
+learn_rel_path: "Configuration"
 -->
 
 # Connect Agent to Cloud
diff --git a/collectors/REFERENCE.md b/collectors/REFERENCE.md
index 96c6057d35..f19533f213 100644
--- a/collectors/REFERENCE.md
+++ b/collectors/REFERENCE.md
@@ -4,7 +4,7 @@ custom_edit_url: "https://github.com/netdata/netdata/edit/master/collectors/REFE
 sidebar_label: "Collectors configuration"
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Setup"
+learn_rel_path: "Configuration"
 -->
 
 # Collectors configuration reference
diff --git a/database/README.md b/database/README.md
index c23e74ec4c..3d4a89467b 100644
--- a/database/README.md
+++ b/database/README.md
@@ -5,7 +5,7 @@ custom_edit_url: "https://github.com/netdata/netdata/edit/master/database/README
 sidebar_label: "Database"
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Setup"
+learn_rel_path: "Configuration"
 -->
 
 # Database
diff --git a/docs/cloud/insights/anomaly-advisor.md b/docs/cloud/insights/anomaly-advisor.md
index 0e99522c4b..adce593a4d 100644
--- a/docs/cloud/insights/anomaly-advisor.md
+++ b/docs/cloud/insights/anomaly-advisor.md
@@ -32,8 +32,6 @@ To enable ML on your Netdata Agent, you need to edit the `[ml]` section in your
 
 At a minimum you just need to set `enabled = yes` to enable ML with default params. More details about configuration can be found in the [Netdata Agent ML docs](https://learn.netdata.cloud/docs/agent/ml#configuration).
 
-**Note**: Follow [this guide](https://github.com/netdata/netdata/blob/master/docs/guides/step-by-step/step-04.md) if you are unfamiliar with making configuration changes in Netdata.
-
 When you have finished your configuration, restart Netdata with a command like `sudo systemctl restart netdata` for the config changes to take effect. You can find more info on restarting Netdata [here](https://github.com/netdata/netdata/blob/master/docs/configure/start-stop-restart.md).
 
 After a brief delay, you should see the number of `trained` dimensions start to increase on the "dimensions" chart of the "Anomaly Detection" menu on the Overview page. By default the `minimum num samples to train = 3600` parameter means at least 1 hour of data is required to train initial models, but you could set this to `900` if you want to train initial models quicker but on less data. Over time, they will retrain on up to `maximum num samples to train = 14400` (4 hours by default), but you could increase this is you wanted to train on more data.
diff --git a/docs/configure/common-changes.md b/docs/configure/common-changes.md
index 933525f9a3..4a2ca7c68a 100644
--- a/docs/configure/common-changes.md
+++ b/docs/configure/common-changes.md
@@ -5,7 +5,7 @@ custom_edit_url: "https://github.com/netdata/netdata/edit/master/docs/configure/
 sidebar_label: "Common configuration changes"
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Setup"
+learn_rel_path: "Configuration"
 -->
 
 # Common configuration changes
diff --git a/docs/configure/nodes.md b/docs/configure/nodes.md
index 0b6ebe6ab3..9ed1c8966e 100644
--- a/docs/configure/nodes.md
+++ b/docs/configure/nodes.md
@@ -2,10 +2,10 @@
 title: "Configure the Netdata Agent"
 description: "Netdata is zero-configuration for most users, but complex infrastructures may require you to tweak some of the Agent's granular settings."
 custom_edit_url: "https://github.com/netdata/netdata/edit/master/docs/configure/nodes.md"
-sidebar_label: "Setup"
+sidebar_label: "Configuration"
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Setup"
+learn_rel_path: "Configuration"
 sidebar_position: 30
 -->
 
diff --git a/docs/configure/secure-nodes.md b/docs/configure/secure-nodes.md
index c3d6a33e80..5381fcc273 100644
--- a/docs/configure/secure-nodes.md
+++ b/docs/configure/secure-nodes.md
@@ -5,7 +5,7 @@ custom_edit_url: "https://github.com/netdata/netdata/edit/master/docs/configure/
 sidebar_label: "Secure your nodes"
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Setup"
+learn_rel_path: "Configuration"
 -->
 
 # Secure your nodes
diff --git a/docs/export/enable-connector.md b/docs/export/enable-connector.md
index 8efd61bde7..02e380e15d 100644
--- a/docs/export/enable-connector.md
+++ b/docs/export/enable-connector.md
@@ -5,7 +5,7 @@ custom_edit_url: "https://github.com/netdata/netdata/edit/master/docs/export/ena
 sidebar_label: "Enable an exporting connector"
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Setup"
+learn_rel_path: "Configuration"
 -->
 
 # Enable an exporting connector
diff --git a/docs/guides/collect-apache-nginx-web-logs.md b/docs/guides/collect-apache-nginx-web-logs.md
index 87137332c2..dc3afc045d 100644
--- a/docs/guides/collect-apache-nginx-web-logs.md
+++ b/docs/guides/collect-apache-nginx-web-logs.md
@@ -4,7 +4,7 @@ sidebar_label: "Monitor Nginx or Apache web server log files with Netdata"
 custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/guides/collect-apache-nginx-web-logs.md
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Guides"
+learn_rel_path: "Miscellaneous"
 -->
 
 # Monitor Nginx or Apache web server log files with Netdata
@@ -120,12 +120,5 @@ You can also edit this file directly with `edit-config`:
 ./edit-config health.d/weblog.conf
 ```
 
-For more information about editing the defaults or writing new alarm entities, see our [health monitoring
-documentation](https://github.com/netdata/netdata/blob/master/health/README.md).
-
-## What's next?
-
-Now that you have web log collection up and running, we recommend you take a look at the collector's [documentation](https://github.com/netdata/go.d.plugin/blob/master/modules/weblog/README.md) for some ideas of how you can turn these rather "boring" logs into powerful real-time tools for keeping your servers happy.
-
-Don't forget to give GitHub user [Wing924](https://github.com/Wing924) a big 👍 for his hard work in starting up the Go
-refactoring effort.
+For more information about editing the defaults or writing new alarm entities, see our 
+[health monitoring documentation](https://github.com/netdata/netdata/blob/master/health/README.md).
diff --git a/docs/guides/collect-unbound-metrics.md b/docs/guides/collect-unbound-metrics.md
index e033af5cb5..c5f4deb518 100644
--- a/docs/guides/collect-unbound-metrics.md
+++ b/docs/guides/collect-unbound-metrics.md
@@ -5,7 +5,7 @@ date: 2020-03-31
 custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/guides/collect-unbound-metrics.md
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Guides"
+learn_rel_path: "Miscellaneous"
 -->
 
 # Monitor Unbound DNS servers with Netdata
diff --git a/docs/guides/configure/performance.md b/docs/guides/configure/performance.md
index 820e8f5982..9782f9af68 100644
--- a/docs/guides/configure/performance.md
+++ b/docs/guides/configure/performance.md
@@ -6,7 +6,7 @@ image: /img/seo/guides/configure/performance.png
 custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/guides/configure/performance.md
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Guides"
+learn_rel_path: "Configuration"
 -->
 
 # How to optimize the Netdata Agent's performance
diff --git a/docs/guides/longer-metrics-storage.md b/docs/guides/longer-metrics-storage.md
deleted file mode 100644
index bea3b8a51f..0000000000
--- a/docs/guides/longer-metrics-storage.md
+++ /dev/null
@@ -1,162 +0,0 @@
-<!--
-title: "Netdata Longer Metrics Retention"
-sidebar_label: "Netdata Longer Metrics Retention"
-description: ""
-custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/guides/longer-metrics-storage.md
-learn_status: "Published"
-learn_topic_type: "Tasks"
-learn_rel_path: "Guides"
--->
-
-# Netdata Longer Metrics Retention
-
-Metrics retention affects 3 parameters on the operation of a Netdata Agent:
-
-1. The disk space required to store the metrics.
-2. The memory the Netdata Agent will require to have that retention available for queries.
-3. The CPU resources that will be required to query longer time-frames.
-
-As retention increases, the resources required to support that retention increase too.
-
-Since Netdata Agents usually run at the edge, inside production systems, Netdata Agent **parents** should be considered. When having a **parent - child** setup, the child (the Netdata Agent running on a production system) delegates all its functions, including longer metrics retention and querying, to the parent node that can dedicate more resources to this task. A single Netdata Agent parent can centralize multiple children Netdata Agents (dozens, hundreds, or even thousands depending on its available resources). 
-
-
-## Ephemerality of metrics
-
-The ephemerality of metrics plays an important role in retention. In environments where metrics stop being collected and new metrics are constantly being generated, we are interested about 2 parameters:
-
-1. The **expected concurrent number of metrics** as an average for the lifetime of the database.
-   This affects mainly the storage requirements.
-
-2. The **expected total number of unique metrics** for the lifetime of the database.
-   This affects mainly the memory requirements for having all these metrics indexed and available to be queried.
-
-## Granularity of metrics
-
-The granularity of metrics (the frequency they are collected and stored, i.e. their resolution) is significantly affecting retention.
-
-Lowering the granularity from per second to every two seconds, will double their retention and half the CPU requirements of the Netdata Agent, without affecting disk space or memory requirements.
-
-## Which database mode to use
-
-Netdata Agents support multiple database modes.
-
-The default mode `[db].mode = dbengine` has been designed to scale for longer retentions.
-
-The other available database modes are designed to minimize resource utilization and should usually be considered on **parent - child** setups at the children side.
-
-So,
-
-* On a single node setup, use `[db].mode = dbengine` to increase retention.
-* On a **parent - child** setup, use `[db].mode = dbengine` on the parent to increase retention and a more resource efficient mode (like `save`, `ram` or `none`) for the child to minimize resources utilization.
-
-To use `dbengine`, set this in `netdata.conf` (it is the default):
-
-```
-[db]
-    mode = dbengine
-```
-
-## Tiering
-
-`dbengine` supports tiering. Tiering allows having up to 3 versions of the data:
-
-1. Tier 0 is the high resolution data.
-2. Tier 1 is the first tier that samples data every 60 data collections of Tier 0.
-3. Tier 2 is the second tier that samples data every 3600 data collections of Tier 0 (60 of Tier 1).
-
-To enable tiering set `[db].storage tiers` in `netdata.conf` (the default is 1, to enable only Tier 0):
-
-```
-[db]
-    mode = dbengine
-    storage tiers = 3
-```
-
-## Disk space requirements
-
-Netdata Agents require about 1 bytes on disk per database point on Tier 0 and 4 times more on higher tiers (Tier 1 and 2). They require 4 times more storage per point compared to Tier 0, because for every point higher tiers store `min`, `max`, `sum`, `count` and `anomaly rate` (the values are 5, but they require 4 times the storage because `count` and `anomaly rate` are 16-bit integers). The `average` is calculated on the fly at query time using `sum / count`.
-
-### Tier 0 - per second for a week
-
-For 2000 metrics, collected every second and retained for a week, Tier 0 needs: 1 byte x 2000 metrics x 3600 secs per hour x 24 hours per day x 7 days per week = 1100MB.
-
-The setting to control this is in `netdata.conf`:
-
-```
-[db]
-    mode = dbengine
-    
-    # per second data collection
-    update every = 1
-    
-    # enable only Tier 0
-    storage tiers = 1
-    
-    # Tier 0, per second data for a week
-    dbengine multihost disk space MB = 1100
-```
-
-By setting it to `1100` and restarting the Netdata Agent, this node will start maintaining about a week of data. But pay attention to the number of metrics. If you have more than 2000 metrics on a node, or you need more that a week of high resolution metrics, you may need to adjust this setting accordingly.
-
-### Tier 1 - per minute for a month
-
-Tier 1 is by default sampling the data every 60 points of Tier 0. If Tier 0 is per second, then Tier 1 is per minute.
-
-Tier 1 needs 4 times more storage per point compared to Tier 0. So, for 2000 metrics, with per minute resolution, retained for a month, Tier 1 needs: 4 bytes x 2000 metrics x 60 minutes per hour x 24 hours per day x 30 days per month = 330MB.
-
-Do this in `netdata.conf`:
-
-```
-[db]
-    mode = dbengine
-    
-    # per second data collection
-    update every = 1
-    
-    # enable only Tier 0 and Tier 1
-    storage tiers = 2
-    
-    # Tier 0, per second data for a week
-    dbengine multihost disk space MB = 1100
-    
-    # Tier 1, per minute data for a month
-    dbengine tier 1 multihost disk space MB = 330
-```
-
-Once `netdata.conf` is edited, the Netdata Agent needs to be restarted for the changes to take effect.
-
-### Tier 2 - per hour for a year
-
-Tier 2 is by default sampling data every 3600 points of Tier 0 (60 of Tier 1). If Tier 0 is per second, then Tier 2 is per hour.
-
-The storage requirements are the same to Tier 1.
-
-For 2000 metrics, with per hour resolution, retained for a year, Tier 2 needs: 4 bytes x 2000 metrics x 24 hours per day x 365 days per year = 67MB.
-
-Do this in `netdata.conf`:
-
-```
-[db]
-    mode = dbengine
-    
-    # per second data collection
-    update every = 1
-    
-    # enable only Tier 0 and Tier 1
-    storage tiers = 3
-    
-    # Tier 0, per second data for a week
-    dbengine multihost disk space MB = 1100
-    
-    # Tier 1, per minute data for a month
-    dbengine tier 1 multihost disk space MB = 330
-
-    # Tier 2, per hour data for a year
-    dbengine tier 2 multihost disk space MB = 67
-```
-
-Once `netdata.conf` is edited, the Netdata Agent needs to be restarted for the changes to take effect.
-
-
-
diff --git a/docs/guides/monitor-cockroachdb.md b/docs/guides/monitor-cockroachdb.md
index bc3c47f939..0d5397c0c4 100644
--- a/docs/guides/monitor-cockroachdb.md
+++ b/docs/guides/monitor-cockroachdb.md
@@ -4,7 +4,7 @@ sidebar_label: "Monitor CockroachDB metrics with Netdata"
 custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/guides/monitor-cockroachdb.md
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Guides"
+learn_rel_path: "Miscellaneous"
 -->
 
 # Monitor CockroachDB metrics with Netdata
@@ -29,7 +29,6 @@ Let's dive in and walk through the process of monitoring CockroachDB metrics wit
   - [Configure the CockroachDB collector](#configure-the-cockroachdb-collector)
     - [Manual setup for a local CockroachDB database](#manual-setup-for-a-local-cockroachdb-database)
   - [Tweak CockroachDB alarms](#tweak-cockroachdb-alarms)
-  - [What's next?](#whats-next)
 
 ## Configure the CockroachDB collector
 
@@ -117,23 +116,3 @@ cd /etc/netdata/ # Replace with your Netdata configuration directory, if not /et
 ```
 
 For more information about editing the defaults or writing new alarm entities, see our documentation on [configuring health alarms](https://github.com/netdata/netdata/blob/master/docs/monitor/configure-alarms.md).
-
-## What's next?
-
-Now that you're collecting metrics from your CockroachDB databases, let us know how it's working for you! There's always
-room for improvement or refinement based on real-world use cases. Feel free to [file an
-issue](https://github.com/netdata/netdata/issues/new?assignees=&labels=bug%2Cneeds+triage&template=BUG_REPORT.yml) with
-your
-thoughts.
-
-Also, be sure to check out these useful resources:
-
-- [Netdata's CockroachDB documentation](https://github.com/netdata/go.d.plugin/blob/master/modules/cockroachdb/README.md)
-- [Netdata's CockroachDB configuration](https://github.com/netdata/go.d.plugin/blob/master/config/go.d/cockroachdb.conf)
-- [Netdata's CockroachDB alarms](https://github.com/netdata/netdata/blob/29d9b5e51603792ee27ef5a21f1de0ba8e130158/health/health.d/cockroachdb.conf)
-- [CockroachDB homepage](https://www.cockroachlabs.com/product/)
-- [CockroachDB documentation](https://www.cockroachlabs.com/docs/stable/)
-- [`_status/vars` endpoint docs](https://www.cockroachlabs.com/docs/stable/monitoring-and-alerting.html#prometheus-endpoint)
-- [Monitor CockroachDB with Prometheus](https://www.cockroachlabs.com/docs/stable/monitor-cockroachdb-with-prometheus.html)
-
-
diff --git a/docs/guides/monitor-hadoop-cluster.md b/docs/guides/monitor-hadoop-cluster.md
index 0fb3b7c407..91282b9559 100644
--- a/docs/guides/monitor-hadoop-cluster.md
+++ b/docs/guides/monitor-hadoop-cluster.md
@@ -4,7 +4,7 @@ sidebar_label: "Monitor a Hadoop cluster with Netdata"
 custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/guides/monitor-hadoop-cluster.md
 learn_status: "Published"
 learn_topic_type: "Tasks"
-learn_rel_path: "Guides"
+learn_rel_path: "Miscellaneous"
 -->
 
 # Monitor a Hadoop cluster with Netdata
@@ -188,20 +188,5 @@ sudo /etc/netdata/edit-config health.d/hdfs.conf
 sudo /etc/netdata/edit-config health.d/zookeeper.conf
 ```
 
-For more information about editing the defaults or writing new alarm entities, see our [health monitoring
-documentation](https://github.com/netdata/netdata/blob/master/health/README.md).
-
-## What's next?
-
-If you're having issues with Netdata auto-detecting your HDFS/Zookeeper servers, or want to help improve how Netdata
-collects or presents metrics from these services, feel free to [file an
-issue](https://github.com/netdata/netdata/issues/new?assignees=&labels=bug%2Cneeds+triage&template=BUG_REPORT.yml).
-
--   Read up on the [HDFS configuration
-    file](https://github.com/netdata/go.d.plugin/blob/master/config/go.d/hdfs.conf) to understand how to configure
-    global options or per-job options, such as username/password, TLS certificates, timeouts, and mo