Update server 4.3+ docs on DLC requiring S3 bucket versioning [ONPREM-1361]

jekyll/_cci2/server/v4.3/installation/phase-1-prerequisites.adoc

@@ -272,7 +272,7 @@ CAUTION: If GitHub Enterprise and CircleCI server are not on the same domain, th
 
 Registering and setting up a new GitHub OAuth app for CircleCI server allows for authorization control to your server installation using GitHub OAuth and for updates to GitHub projects/repos using build status information. The following steps apply for both github.com and GitHub Enterprise.
 
-. In your browser, navigate to **your GitHub instance** > **User Settings** > **Developer Settings** > **OAuth Apps** and click the **New OAuth App** button.
+. In your browser, navigate to **your GitHub instance** > **User Settings** > **Developer Settings** > **OAuth Apps** and select the **New OAuth App** button.
 +
 .New GitHub OAuth App
 image::github-oauth-new.png[Screenshot showing setting up a new OAuth app]
@@ -302,7 +302,7 @@ ifndef::env-gcp[]
 === GCP - Reserve a static external IP address
 The link:https://cloud.google.com/compute/docs/ip-addresses/reserve-static-external-ip-address#external-ip[Google Cloud docs] provide information on how reserve an IP address.
 
-Make note of the returned IPv4 address for use later in the values.yaml file.
+Make note of the returned IPv4 address for use later in the `values.yaml` file.
 
 endif::env-gcp[]
 
@@ -327,7 +327,7 @@ aws ec2 allocate-address
 #}
 ----
 
-Make note of each of the returned `AllocationId` values from the CLI for use in the values.yaml file.
+Make note of each of the returned `AllocationId` values from the CLI for use in the `values.yaml` file.
 
 endif::env-aws[]
 
@@ -482,7 +482,7 @@ NOTE: If you are installing behind a proxy, object storage should be behind this
 ifndef::env-gcp[]
 
 [#s3-storage]
-=== S3 Storage
+=== S3 storage
 
 [#create-aws-s3-bucket]
 ==== a. Create AWS S3 Bucket
@@ -495,19 +495,29 @@ aws s3api create-bucket \
     --create-bucket-configuration LocationConstraint=<YOUR_REGION>
 ----
 
+==== b. Enable bucket versioning
+
+To use the link:https://circleci.com/docs/docker-layer-caching/[Docker layer caching] (DLC) feature in CircleCI, link:https://docs.aws.amazon.com/AmazonS3/latest/userguide/Versioning.html[bucket versioning] needs to be enabled. Run the following command to enable bucket versioning on the bucket created in the previous step:
+[source,shell]
+----
+aws s3api put-bucket-versioning \
+    --bucket <YOUR_BUCKET_NAME> \
+    --region <YOUR_REGION> \
+    --versioning-configuration Status=Enabled
+----
 
 [#set-up-authentication-aws]
-==== b. Set up authentication
+==== c. Set up authentication
 
-There are two ways to authenticate CircleCI with S3: IAM Roles for Service Accounts (IRSA), and IAM access keys. IRSA is the recommended method.
+Two ways to authenticate CircleCI with S3 are: IAM Roles for Service Accounts (IRSA), and IAM access keys. IRSA is the recommended method.
 
 [.tab.authentication.IRSA]
 --
 **Option 1:** IRSA
 
 The following is a summary of link:https://docs.aws.amazon.com/eks/latest/userguide/iam-roles-for-service-accounts.html[AWS's Documentation on IRSA] that is sufficient for installing CircleCI.
 
-. Create an IAM OIDC identity provider for your EKS Cluster.
+. Create an IAM OIDC Identity Provider for your EKS Cluster.
 +
 [source,shell]
 ----

jekyll/_cci2/server/v4.3/installation/upgrade-server.adoc

@@ -28,14 +28,15 @@ To see some common upgrade path options, see link:https://support.circleci.com/h
 [#notes]
 == Notes on changes in v4.3
 
-Please note the following significant changes in server v4.3.
+Note the following significant changes in server v4.3.
 
 [#dlc]
-=== Docker layer caching (DLC)
+=== Docker layer caching (or DLC)
 
 * Old DLC volumes will not be carried over and need to be wiped manually
 * Projects that stop using DLC will not delete final DLC cache without manual intervention
 * DLC now runs through S3 and GCS instead of SSD Volumes
+* If AWS S3 is used for xref:phase-1-prerequisites#s3-storage[object storage], the use of Docker layer caching (DLC) requires link:https://docs.aws.amazon.com/AmazonS3/latest/userguide/manage-versioning-examples.html[versioning to be enabled] on the bucket.
 
 [#machine]
 === Machine jobs
@@ -64,7 +65,7 @@ Please note the following significant changes in server v4.3.
 [#workflows-conductor]
 === Workflows conductor
 
-* There is a `workflows-conductor` data migration that will run as a job in the background after your upgrade. The migration processes projects in batches of 1000 and sleeps for 60 seconds before starting another. Processing time for a batch depends on the MongoDB and PostgreSQL data stores, but in our production environment, a batch of 1000 projects took around 6 seconds.
+* A `workflows-conductor` data migration will run as a job in the background after your upgrade. The migration processes projects in batches of 1000 and sleeps for 60 seconds before starting another. Processing time for a batch depends on the MongoDB and PostgreSQL data stores, but in our production environment, a batch of 1000 projects took around 6 seconds.
 * Ensure that your CircleCI server v4.3 installation is left running until after the migration has completed. You can confirm that the migration has completed by checking the logs of `workflows-conductor-event-consumer`. There will be a `starting next-build-seq-migration` log message with `project_count=0`
 
 [#vault]
@@ -84,9 +85,9 @@ Please note the following significant changes in server v4.3.
 [#upgrade-steps]
 == Upgrade steps
 
-NOTE: This upgrade is a disruptive process and downtime is expected. Please do not attempt to run jobs during this upgrade.
+NOTE: This upgrade is a disruptive process and downtime is expected. Do not attempt to run jobs during this upgrade.
 
-. Ensure your cluster is running a compatible kubernetes version for this release (1.26 - 1.29).
+. Ensure your cluster is running a compatible Kubernetes version for this release (1.26 - 1.29).
 
 . Check the link:https://circleci.com/server/changelog/[changelog] and make sure there are no actions you need to take before deploying a new version.
 

jekyll/_cci2/server/v4.4/installation/phase-1-prerequisites.adoc

@@ -285,7 +285,7 @@ CAUTION: If GitHub Enterprise and CircleCI server are not on the same domain, th
 
 Registering and setting up a new GitHub OAuth app for CircleCI server allows for authorization control to your server installation using GitHub OAuth and for updates to GitHub projects/repos using build status information. The following steps apply for both github.com and GitHub Enterprise.
 
-. In your browser, navigate to **your GitHub instance** > **User Settings** > **Developer Settings** > **OAuth Apps** and click the **New OAuth App** button.
+. In your browser, navigate to **your GitHub instance** > **User Settings** > **Developer Settings** > **OAuth Apps** and select the **New OAuth App** button.
 +
 .New GitHub OAuth App
 image::github-oauth-new.png[Screenshot showing setting up a new OAuth app]
@@ -315,7 +315,7 @@ ifndef::env-gcp[]
 === GCP: Reserve a static external IP address
 The link:https://cloud.google.com/compute/docs/ip-addresses/reserve-static-external-ip-address#external-ip[Google Cloud docs] provide information on how reserve an IP address.
 
-Make note of the returned IPv4 address for use later in the values.yaml file.
+Make note of the returned IPv4 address for use later in the `values.yaml` file.
 
 endif::env-gcp[]
 
@@ -340,7 +340,7 @@ aws ec2 allocate-address
 #}
 ----
 
-Make note of each of the returned `AllocationId` values from the CLI for use in the values.yaml file.
+Make note of each of the returned `AllocationId` values from the CLI for use in the `values.yaml` file.
 
 endif::env-aws[]
 
@@ -508,19 +508,29 @@ aws s3api create-bucket \
     --create-bucket-configuration LocationConstraint=<YOUR_REGION>
 ----
 
+==== b. Enable bucket versioning
+
+To use the link:https://circleci.com/docs/docker-layer-caching/[Docker layer caching] (DLC) feature in CircleCI, link:https://docs.aws.amazon.com/AmazonS3/latest/userguide/Versioning.html[bucket versioning] needs to be enabled. Run the following command to enable bucket versioning on the bucket created in the previous step:
+[source,shell]
+----
+aws s3api put-bucket-versioning \
+    --bucket <YOUR_BUCKET_NAME> \
+    --region <YOUR_REGION> \
+    --versioning-configuration Status=Enabled
+----
 
 [#set-up-authentication-aws]
-==== b. Set up authentication
+==== c. Set up authentication
 
-There are two ways to authenticate CircleCI with S3: IAM Roles for Service Accounts (IRSA), and IAM access keys. IRSA is the recommended method.
+Two ways to authenticate CircleCI with S3 are: IAM Roles for Service Accounts (IRSA), and IAM access keys. IRSA is the recommended method.
 
 [.tab.authentication.IRSA]
 --
 **Option 1:** IRSA
 
 The following is a summary of link:https://docs.aws.amazon.com/eks/latest/userguide/iam-roles-for-service-accounts.html[AWS's Documentation on IRSA] that is sufficient for installing CircleCI.
 
-. Create an IAM OIDC identity provider for your EKS Cluster.
+. Create an IAM OIDC Identity Provider for your EKS Cluster.
 +
 [source,shell]
 ----

jekyll/_cci2/server/v4.5/installation/phase-1-prerequisites.adoc

@@ -274,7 +274,7 @@ CAUTION: If GitHub Enterprise and CircleCI server are not on the same domain, th
 
 Registering and setting up a new GitHub OAuth app for CircleCI server allows for authorization control to your server installation using GitHub OAuth and for updates to GitHub projects/repos using build status information. The following steps apply for both github.com and GitHub Enterprise.
 
-. In your browser, navigate to **your GitHub instance** > **User Settings** > **Developer Settings** > **OAuth Apps** and click the **New OAuth App** button.
+. In your browser, navigate to **your GitHub instance** > **User Settings** > **Developer Settings** > **OAuth Apps** and select the **New OAuth App** button.
 +
 .New GitHub OAuth App
 image::github-oauth-new.png[Screenshot showing setting up a new OAuth app]
@@ -511,11 +511,20 @@ aws s3api create-bucket \
     --create-bucket-configuration LocationConstraint=<YOUR_REGION>
 ----
 
+==== b. Enable bucket versioning
 
-[#set-up-authentication-aws]
-==== b. Set up authentication
+To use the link:https://circleci.com/docs/docker-layer-caching/[Docker layer caching] (DLC) feature in CircleCI, link:https://docs.aws.amazon.com/AmazonS3/latest/userguide/Versioning.html[bucket versioning] needs to be enabled. Run the following command to enable bucket versioning on the bucket created in the previous step:
+[source,shell]
+----
+aws s3api put-bucket-versioning \
+    --bucket <YOUR_BUCKET_NAME> \
+    --region <YOUR_REGION> \
+    --versioning-configuration Status=Enabled
+----
 
-There are two ways to authenticate CircleCI with S3: IAM Roles for Service Accounts (IRSA), and IAM access keys. IRSA is the recommended method.
+[#set-up-authentication-aws]
+==== c. Set up authentication
+Two ways to authenticate CircleCI with S3 are: IAM Roles for Service Accounts (IRSA), and IAM access keys. IRSA is the recommended method.
 
 [.tab.authentication.IRSA]
 --