Add Cloud Native Hybrid instructions on 3k users RA page

doc/administration/reference_architectures/2k_users.md

@@ -18,20 +18,20 @@ For a full list of reference architectures, see
 
 | Service                                  | Nodes  | Configuration           | GCP             | AWS          | Azure    |
 |------------------------------------------|--------|-------------------------|-----------------|--------------|----------|
-| Load balancer(3)                         | 1      | 2 vCPU, 1.8 GB memory   | `n1-highcpu-2`  | `c5.large`   | `F2s v2` |
-| PostgreSQL(1)                            | 1      | 2 vCPU, 7.5 GB memory   | `n1-standard-2` | `m5.large`   | `D2s v3` |
-| Redis(2)                                 | 1      | 1 vCPU, 3.75 GB memory  | `n1-standard-1` | `m5.large`   | `D2s v3` |
+| Load balancer<sup>3</sup>                | 1      | 2 vCPU, 1.8 GB memory   | `n1-highcpu-2`  | `c5.large`   | `F2s v2` |
+| PostgreSQL<sup>1</sup>                   | 1      | 2 vCPU, 7.5 GB memory   | `n1-standard-2` | `m5.large`   | `D2s v3` |
+| Redis<sup>2</sup>                        | 1      | 1 vCPU, 3.75 GB memory  | `n1-standard-1` | `m5.large`   | `D2s v3` |
 | Gitaly                                   | 1      | 4 vCPU, 15 GB memory    | `n1-standard-4` | `m5.xlarge`  | `D4s v3` |
 | GitLab Rails                             | 2      | 8 vCPU, 7.2 GB memory   | `n1-highcpu-8`  | `c5.2xlarge` | `F8s v2` |
 | Monitoring node                          | 1      | 2 vCPU, 1.8 GB memory   | `n1-highcpu-2`  | `c5.large`   | `F2s v2` |
-| Object storage(4)                        | n/a    | n/a                     | n/a             | n/a          | n/a      |
+| Object storage<sup>4</sup>               | n/a    | n/a                     | n/a             | n/a          | n/a      |
 | NFS server (optional, not recommended)   | 1      | 4 vCPU, 3.6 GB memory   | `n1-highcpu-4`  | `c5.xlarge`  | `F4s v2` |
 
 <!-- markdownlint-disable MD029 -->
-1. Can be optionally run on reputable third party external PaaS PostgreSQL solutions. Google Cloud SQL and AWS RDS are known to work, however Azure Database for PostgreSQL is [not recommended](https://gitlab.com/gitlab-org/quality/reference-architectures/-/issues/61) due to performance issues. Consul is primarily used for PostgreSQL high availability so can be ignored when using a PostgreSQL PaaS setup. However it is also used optionally by Prometheus for Omnibus auto host discovery.
-2. Can be optionally run as reputable third party external PaaS Redis solutions. Google Memorystore and AWS Elasticache are known to work.
-3. Can be optionally run as reputable third party load balancing services (LB PaaS). AWS ELB is known to work.
-4. Should be run on reputable third party object storage (storage PaaS) for cloud implementations. Google Cloud Storage and AWS S3 are known to work.
+1. Can be optionally run on reputable third-party external PaaS PostgreSQL solutions. Google Cloud SQL and AWS RDS are known to work, however Azure Database for PostgreSQL is [not recommended](https://gitlab.com/gitlab-org/quality/reference-architectures/-/issues/61) due to performance issues. Consul is primarily used for PostgreSQL high availability so can be ignored when using a PostgreSQL PaaS setup. However it is also used optionally by Prometheus for Omnibus auto host discovery.
+2. Can be optionally run as reputable third-party external PaaS Redis solutions. Google Memorystore and AWS Elasticache are known to work.
+3. Can be optionally run as reputable third-party load balancing services (LB PaaS). AWS ELB is known to work.
+4. Should be run on reputable third-party object storage (storage PaaS) for cloud implementations. Google Cloud Storage and AWS S3 are known to work.
 <!-- markdownlint-enable MD029 -->
 
 NOTE:

doc/administration/reference_architectures/index.md

@@ -71,6 +71,7 @@ The following reference architectures are available:
 
 The following Cloud Native Hybrid reference architectures, where select recommended components can be run in Kubernetes, are available:
 
+- [Up to 3,000 users](3k_users.md#cloud-native-hybrid-reference-architecture-with-helm-charts-alternative)
 - [Up to 5,000 users](5k_users.md#cloud-native-hybrid-reference-architecture-with-helm-charts-alternative)
 - [Up to 10,000 users](10k_users.md#cloud-native-hybrid-reference-architecture-with-helm-charts-alternative)
 - [Up to 25,000 users](25k_users.md#cloud-native-hybrid-reference-architecture-with-helm-charts-alternative)