Backport of NET-4952 Add docs for export command into release/1.16.x (#18449)

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Co-authored-by: Nathan Coleman <nathan.coleman@hashicorp.com>

website/content/commands/services/export.mdx

@@ -0,0 +1,64 @@
+---
+layout: commands
+page_title: 'Commands: Services Export'
+description: |
+  The `consul services export` command exports a service from one peer or admin partition to another.
+---
+
+# Consul Services Export
+
+Command: `consul services export`
+
+The `services export` command exports a service from one admin partition
+or cluster peer to another. This command can be used in lieu of creating or updating the corresponding
+`exported-services` configuration entry. Running the command multiple times with the same
+arguments results in a no-op.
+
+```text
+Usage: consul services export [options] -name <service name> -consumer-peers <other cluster name>
+
+  Export a service to a peered cluster.
+
+      $ consul services export -name=web -consumer-peers=other-cluster
+
+  Use the -consumer-partitions flag instead of -consumer-peers to export to a different partition in the same cluster.
+
+      $ consul services export -name=web -consumer-partitions=other-partition
+
+  Additional flags and more advanced use cases are detailed below.
+```
+
+#### Command options
+
+- `-name=<string>` - (Required) The name of the service to export.
+
+- `-consumer-peers=<string>` - (Required) A comma-separated list of cluster peers to export the service to.
+  In Consul Enterprise, this flag is optional when `-consumer-partitions` is specified.
+
+#### Enterprise options
+
+- `-consumer-partitions=<string>` - A comma-separated list of admin partitions within the
+  same datacenter to export the service to. This flag is optional when `-consumer-peers` is specified.
+
+@include 'http_api_partition_options.mdx'
+
+@include 'http_api_namespace_options.mdx'
+
+#### API options
+
+@include 'http_api_options_client.mdx'
+
+## Examples
+
+In the following example, the `consul services export` command makes the `web` service available to services running in a cluster named `dc2` that has a previously-established cluster peering connection.
+
+```shell-session hideClipboard
+$ consul services export -name=web -consumer-peers=dc2
+```
+
+In the following example, the `consul services export` command makes the `web` service located in the
+namespace `ns1` and the admin partition `alpha` to other admin partitions named `beta` and `delta`.
+
+```shell-session hideClipboard
+$ consul services export -name=web -namespace=ns1 -partition=alpha -consumer-partitions=beta,delta
+```

website/content/commands/services/index.mdx

@@ -31,6 +31,7 @@ Usage: consul services <subcommand> [options] [args]
 Subcommands:
     deregister    Deregister services with the local agent
     register      Register services with the local agent
+    export        Export services from one cluster peer or admin partition to another
 ```
 
 For more information, examples, and usage about a subcommand, click on the name

website/data/commands-nav-data.json

@@ -487,6 +487,10 @@
       {
         "title": "deregister",
         "path": "services/deregister"
+      },
+      {
+        "title": "export",
+        "path": "services/export"
       }
     ]
   },