Remove duplicate manual NTP check

The NTP check is now included in `gitlab-rake gitlab:geo:check`

changelogs/unreleased-ee/jramsay4480-remove-ntp-check-from-geo-docs.yml

+---
+title: Remove unnecessary NTP checks now included in gitlab:geo:check
+merge_request: 3940
+author:
+type: other

doc/gitlab-geo/database.md

@@ -242,23 +242,6 @@ The following guide assumes that:
     will need it when setting up the secondary! The certificate is not sensitive
     data.
 
-1. Verify that clock synchronization is enabled.
-
-    >**Important:**
-    For Geo to work correctly, all nodes must have their clocks
-    synchronized. It is not required for all nodes to be set to the same time
-    zone, but when the respective times are converted to UTC time, the clocks
-    must be synchronized to within 60 seconds of each other.
-
-    Verify NTP sync is enabled using:
-
-    ```bash
-    timedatectl status | grep 'NTP synchronized'
-    ```
-
-    Refer to your Linux distribution documentation to setup clock
-    synchronization. This can easily be done using any NTP-compatible daemon.
-
 ### Step 2. Add the secondary GitLab node
 
 To prevent the secondary geo node from trying to act as the primary once the
@@ -371,12 +354,6 @@ because we have not yet configured the secondary server. This is the next step.
     gitlab-ctl reconfigure
     ```
 
-1. Verify that clock synchronization is enabled, using:
-
-    ```bash
-    timedatectl status | grep 'NTP synchronized'
-    ```
-
 1. Verify the secondary if configured correctly and that the primary is
    reachable:
 

doc/gitlab-geo/database_source.md

@@ -201,23 +201,6 @@ The following guide assumes that:
    `netstat -plnt` to make sure that PostgreSQL is listening to the server's
    public IP.
 
-1. Verify that clock synchronization is enabled.
-
-    >**Important:**
-    For Geo to work correctly, all nodes must have their clocks
-    synchronized. It is not required for all nodes to be set to the same time
-    zone, but when the respective times are converted to UTC time, the clocks
-    must be synchronized to within 60 seconds of each other.
-
-    Verify NTP sync is enabled, using:
-
-    ```bash
-    timedatectl status | grep 'NTP synchronized'
-    ```
-
-    Refer to your Linux distribution documentation to setup clock
-    synchronization. This can easily be done using any NTP-compatible daemon.
-
 ### Step 2. Add the secondary GitLab node
 
 Follow the steps in ["add the secondary GitLab node"](database.md#step-2-add-the-secondary-gitlab-node).
@@ -243,12 +226,6 @@ the primary's database" step, continue here:
 
 1. Restart PostgreSQL for the changes to take effect.
 
-1. Verify that clock synchronization is enabled, using:
-
-    ```bash
-    timedatectl status | grep 'NTP synchronized'
-    ```
-
 #### Enable tracking database on the secondary server
 
 Geo secondary nodes use a tracking database to keep track of replication status