[Alerting][Docs] Changed alerting documentation to point to a single …

…source of explaining the configurations. (elastic#92942)

* [Alerting][Docs] Changed alerting documentation to poin to a single source of explaining the configurations.

* fixed due to comments

* fixed due to comments

* Apply suggestions from code review

Co-authored-by: gchaps <33642766+gchaps@users.noreply.github.com>

* fixed due to comments

Co-authored-by: gchaps <33642766+gchaps@users.noreply.github.com>

docs/settings/alert-action-settings.asciidoc

@@ -40,6 +40,8 @@ You can configure the following settings in the `kibana.yml` file.
 
 [cols="2*<"]
 |===
+| `xpack.actions.enabled`
+  | Feature toggle that enables Actions in {kib}. Defaults to `true`.
 
 | `xpack.actions.allowedHosts` {ess-icon}
   | A list of hostnames that {kib} is allowed to connect to when built-in actions are triggered. It defaults to `[*]`, allowing any host, but keep in mind the potential for SSRF attacks when hosts are not explicitly added to the allowed hosts. An empty list `[]` can be used to block built-in actions from making any external connections. +
@@ -51,6 +53,24 @@ You can configure the following settings in the `kibana.yml` file.
   +
   Disabled action types will not appear as an option when creating new connectors, but existing connectors and actions of that type will remain in {kib} and will not function.
 
+| `xpack.actions.preconfigured`
+  | Specifies preconfigured action IDs and configs. Defaults to {}.
+
+| `xpack.actions.proxyUrl` {ess-icon}
+  | Specifies the proxy URL to use, if using a proxy for actions. By default, no proxy is used.
+
+| `xpack.actions.proxyHeaders` {ess-icon}
+  | Specifies HTTP headers for the proxy, if using a proxy for actions. Defaults to {}.
+
+a|`xpack.actions.`
+`proxyRejectUnauthorizedCertificates` {ess-icon}
+  | Set to `false` to bypass certificate validation for the proxy, if using a proxy for actions. Defaults to `true`.
+
+| `xpack.actions.rejectUnauthorized` {ess-icon}
+  | Set to `false` to bypass certificate validation for actions. Defaults to `true`. +
+  +
+  As an alternative to setting both `xpack.actions.proxyRejectUnauthorizedCertificates` and `xpack.actions.rejectUnauthorized`, you can point the OS level environment variable `NODE_EXTRA_CA_CERTS` to a file that contains the root CAs needed to trust certificates.
+
 |===
 
 [float]

docs/user/alerting/action-types/pre-configured-connectors.asciidoc

@@ -95,7 +95,7 @@ This example shows a preconfigured action type with one out-of-the box connector
       name: 'Server log #xyz'
 ```
 
-<1> `enabledActionTypes` excludes the preconfigured action type to prevent creating and deleting connectors.
+<1> `enabledActionTypes` prevents the preconfigured action type from creating and deleting connectors. For more details, check <<action-settings, Action settings>>.
 <2> `preconfigured` is the setting for defining the list of available connectors for the preconfigured action type.
 
 [[managing-pre-configured-action-types]]

docs/user/alerting/alerting-getting-started.asciidoc

@@ -157,7 +157,7 @@ Pre-packaged *alert types* simplify setup, hide the details complex domain-speci
 
 If you are using an *on-premises* Elastic Stack deployment:
 
-* In the kibana.yml configuration file, add the <<alert-action-settings-kb,`xpack.encryptedSavedObjects.encryptionKey`>> setting.
+* In the kibana.yml configuration file, add the <<general-alert-action-settings,`xpack.encryptedSavedObjects.encryptionKey`>> setting.
 * For emails to have a footer with a link back to {kib}, set the <<server-publicBaseUrl, `server.publicBaseUrl`>> configuration setting.
 
 If you are using an *on-premises* Elastic Stack deployment with <<using-kibana-with-security, *security*>>:

docs/user/alerting/alerting-production-considerations.asciidoc

@@ -2,17 +2,17 @@
 [[alerting-production-considerations]]
 == Production considerations
 
-{kib} alerting run both alert checks and actions as persistent background tasks managed by the Kibana Task Manager. This has two major benefits:
+{kib} alerting runs both alert checks and actions as persistent background tasks managed by the Kibana Task Manager. This has two major benefits:
 
-* *Persistence*: all task state and scheduling is stored in {es}, so if {kib} is restarted, alerts and actions will pick up where they left off.  Task definitions for alerts and actions are stored in the index specified by `xpack.task_manager.index` (defaults to `.kibana_task_manager`).  It is important to have at least 1 replica of this index for production deployments, since if you lose this index all scheduled alerts and actions are also lost.
+* *Persistence*: all task state and scheduling is stored in {es}, so if you restart {kib}, alerts and actions will pick up where they left off.  Task definitions for alerts and actions are stored in the index specified by <<task-manager-settings, `xpack.task_manager.index`>>.  The default is `.kibana_task_manager`.  You must have at least one replica of this index for production deployments.  If you lose this index, all scheduled alerts and actions are lost.
 * *Scaling*: multiple {kib} instances can read from and update the same task queue in {es}, allowing the alerting and action load to be distributed across instances. In cases where a {kib} instance no longer has capacity to run alert checks or actions, capacity can be increased by adding additional {kib} instances.
 
 [float]
 === Running background alert checks and actions
 
 {kib} background tasks are managed by:
 
-* Polling an {es} task index for overdue tasks at 3 second intervals.  This interval can be changed using the `xpack.task_manager.poll_interval` setting.
+* Polling an {es} task index for overdue tasks at 3 second intervals.  You can change this interval using the <<task-manager-settings, `xpack.task_manager.poll_interval`>> setting.
 * Tasks are then claiming them by updating them in the {es} index, using optimistic concurrency control to prevent conflicts. Each {kib} instance can run a maximum of 10 concurrent tasks, so a maximum of 10 tasks are claimed each interval. 
 * Tasks are run on the {kib} server. 
 * In the case of alerts which are recurring background checks, upon completion the task is scheduled again according to the <<defining-alerts-general-details, check interval>>.
@@ -32,4 +32,4 @@ For details on the settings that can influence the performance and throughput of
 [float]
 === Deployment considerations
 
-{es} and {kib} instances use the system clock to determine the current time. To ensure schedules are triggered when expected, you should synchronize the clocks of all nodes in the cluster using a time service such as http://www.ntp.org/[Network Time Protocol].
+{es} and {kib} instances use the system clock to determine the current time. To ensure schedules are triggered when expected, you should synchronize the clocks of all nodes in the cluster using a time service such as http://www.ntp.org/[Network Time Protocol].

docs/user/alerting/defining-alerts.asciidoc

@@ -101,29 +101,9 @@ image::images/alert-flyout-add-action.png[You can add multiple actions on an ale
 
 [NOTE]
 ==============================================
-Actions are not required on alerts. In some cases you may want to run an alert without actions first to understand its behavior, and configure actions later.
+Actions are not required on alerts. You can run an alert without actions to understand its behavior, and then <<action-settings, configure actions>> later.
 ==============================================
 
-[float]
-[[actions-configuration]]
-=== Global actions configuration
-Some actions configuration options apply to all actions.
-If you are using an *on-prem* Elastic Stack deployment, you can set these in the kibana.yml file.
-If you are using a cloud deployment, you can set these via the console.
-
-Here's a list of the available global configuration options and an explanation of what each one does:
-
-* `xpack.actions.enabled`: Feature toggle that enables Actions in {kib}. Default: `true`
-* `xpack.actions.allowedHosts`: Specifies an array of host names which actions such as email, Slack, PagerDuty, and webhook can connect to. An element of * indicates any host can be connected to. An empty array indicates no hosts can be connected to. Default: [ {asterisk} ]
-* `xpack.actions.enabledActionTypes`: Specifies an array of action types that are enabled. An {asterisk} indicates all action types registered are enabled. The action types that {kib} provides are `.email`, `.index`, `.jira`, `.pagerduty`, `.resilient`, `.server-log`, `.servicenow`, `.servicenow-sir`, `.slack`,   `.teams`, and `.webhook`. Default: [ {asterisk} ]
-* `xpack.actions.preconfigured`: Specifies preconfigured action IDs and configs. Default: {}
-* `xpack.actions.proxyUrl`: Specifies the proxy URL to use, if using a proxy for actions.
-* `xpack.actions.proxyHeader`: Specifies HTTP headers for proxy, if using a proxy for actions.
-* `xpack.actions.proxyRejectUnauthorizedCertificates`: Set to `false` to bypass certificate validation for proxy, if using a proxy for actions.
-* `xpack.actions.rejectUnauthorized`: Set to `false` to bypass certificate validation for actions.
-
-*NOTE:* As an alternative to both `xpack.actions.proxyRejectUnauthorizedCertificates` and `xpack.actions.rejectUnauthorized`, the OS level environment variable `NODE_EXTRA_CA_CERTS` can be set to point to a file that contains the root CA(s) needed for certificates to be trusted. 
-
 [float]
 === Managing alerts
 

x-pack/plugins/triggers_actions_ui/README.md

@@ -1149,7 +1149,7 @@ triggersActionsUi.actionTypeRegistry.register(getSomeNewActionType());
 
 ## Create and register new action type UI
 
-Before starting the UI implementation, the [server side registration](https://github.com/elastic/kibana/tree/master/x-pack/plugins/actions#kibana-actions-configuration) should be done first.
+Before starting the UI implementation, the [server side registration](https://github.com/elastic/kibana/tree/master/x-pack/plugins/actions#action-types) should be done first.
 
 Action type UI is expected to be defined as `ActionTypeModel` object.