3468 document replications data in metrics endpoint (#5406)

* chore: Add placeholder format to Docker example.

* chore: Add placeholder formatting to Docker example.

* feat(v2): Add /metrics replications to metrics page and guide.

Closes #3468

* Update content/influxdb/v2/write-data/replication/replicate-data.md

Co-authored-by: Scott Anderson <sanderson@users.noreply.github.com>

---------

Co-authored-by: Scott Anderson <sanderson@users.noreply.github.com>

content/influxdb/v2/install/_index.md

@@ -483,6 +483,8 @@ The following guide uses [Docker CLI commands](https://docs.docker.com/reference
 
    <!--pytest.mark.skip-->
 
+{{% code-placeholders "ADMIN_(USERNAME|PASSWORD)|ORG_NAME|BUCKET_NAME" %}}
+
    ```sh
    docker run \
     --name influxdb2 \
@@ -490,13 +492,15 @@ The following guide uses [Docker CLI commands](https://docs.docker.com/reference
     --mount type=volume,source=influxdb2-data,target=/var/lib/influxdb2 \
     --mount type=volume,source=influxdb2-config,target=/etc/influxdb2 \
     --env DOCKER_INFLUXDB_INIT_MODE=setup \
-    --env DOCKER_INFLUXDB_INIT_USERNAME=<USERNAME> \
-    --env DOCKER_INFLUXDB_INIT_PASSWORD=<PASSWORD> \
-    --env DOCKER_INFLUXDB_INIT_ORG=<ORG_NAME> \
-    --env DOCKER_INFLUXDB_INIT_BUCKET=<BUCKET_NAME> \
+    --env DOCKER_INFLUXDB_INIT_USERNAME=ADMIN_USERNAME \
+    --env DOCKER_INFLUXDB_INIT_PASSWORD=ADMIN_PASSWORD \
+    --env DOCKER_INFLUXDB_INIT_ORG=ORG_NAME \
+    --env DOCKER_INFLUXDB_INIT_BUCKET=BUCKET_NAME \
     influxdb:2
    ```
 
+{{% /code-placeholders %}}
+
    The command passes the following arguments:
 
    - `--publish 8086:8086`: Exposes the InfluxDB [UI](/influxdb/v2/get-started/#influxdb-user-interface-ui) and [HTTP API](/influxdb/v2/reference/api/) on the host's `8086` port.
@@ -504,10 +508,11 @@ The following guide uses [Docker CLI commands](https://docs.docker.com/reference
    - `--mount type=volume,source=influxdb2-config,target=/etc/influxdb2`: Creates a volume named `influxdb2-config` mapped to the [InfluxDB configuration directory](/influxdb/v2/reference/internals/file-system-layout/?t=docker#file-system-layout) to make configurations available outside the container.
    - `-e DOCKER_INFLUXDB_INIT_MODE=setup`: Environment variable that invokes the automated setup of the initial organization, user, bucket, and token when creating the container.
    - `-e DOCKER_INFLUXDB_INIT_<SETUP_OPTION>`: Environment variables for initial setup options--replace the following with your own values:
-     - `<USERNAME>`: The username for the initial [user](/influxdb/v2/admin/users/)--an admin user with an API [Operator token](/influxdb/v2/admin/tokens/#operator-token).
-     - `<PASSWORD>`: The password for the initial [user](/influxdb/v2/admin/users/).
-     - `<ORG_NAME>`: The name for the initial [organization](/influxdb/v2/admin/organizations/).
-     - `<BUCKET_NAME>`: The name for the initial [bucket](/influxdb/v2/admin/buckets/).
+
+     - {{% code-placeholder-key %}}`ADMIN_USERNAME`{{% /code-placeholder-key %}}: The username for the initial [user](/influxdb/v2/admin/users/)--an admin user with an API [Operator token](/influxdb/v2/admin/tokens/#operator-token).
+     - {{% code-placeholder-key %}}`ADMIN_PASSWORD`{{% /code-placeholder-key %}}: The password for the initial [user](/influxdb/v2/admin/users/).
+     - {{% code-placeholder-key %}}`ORG_NAME`{{% /code-placeholder-key %}}: The name for the initial [organization](/influxdb/v2/admin/organizations/).
+     - {{% code-placeholder-key %}}`BUCKET_NAME`{{% /code-placeholder-key %}}: The name for the initial [bucket](/influxdb/v2/admin/buckets/).
 
     For more options, see the [`influxdb` Docker Hub image](https://hub.docker.com/_/influxdb) documentation.
     _If you don't specify InfluxDB initial setup options, you can [set up manually](#set-up-influxdb) later using the UI or CLI in a running container._

content/influxdb/v2/write-data/replication/replicate-data.md

@@ -20,6 +20,12 @@ InfluxDB OSS, InfluxDB Cloud, or InfluxDB Enterprise instance.
 
 Replicate data from InfluxDB OSS to InfluxDB Cloud, InfluxDB OSS, or InfluxDB Enterprise.
 
+- [Configure a replication stream](#configure-a-replication-stream)
+- [Replicate downsampled or processed data](#replicate-downsampled-or-processed-data)
+{{% oss-only %}}
+- [View replication service metrics](#view-influxdb-oss-replication-service-metrics)
+{{% /oss-only %}}
+
 ## Configure a replication stream
 
 Use the [`influx` CLI](/influxdb/v2/tools/influx-cli/) or the
@@ -275,3 +281,11 @@ In some cases, you may not want to write raw, high-precision data to a remote In
     ```
 
 3. [Create a replication stream](#configure-a-replication-stream) to replicate data from the downsampled bucket to the remote InfluxDB {{% cloud-only %}}Cloud {{% /cloud-only %}}instance.
+
+## View InfluxDB OSS replication service metrics
+
+In addition to replication stream information that you can access using the [CLI](?t=CLI#configure-a-replication-stream) or [API](?t=API#configure-a-replication-stream), you can view replication service-level metrics for your InfluxDB OSS instance, such as `/api/v2/write` error details, the number and duration of calls to the service, and the total number of points queued.
+
+To view replication service-level metrics send a `GET` request to your local InfluxDB  OSS `/metrics` endpoint.
+
+For more information, see [InfluxDB OSS metrics](/influxdb/v2/reference/internals/metrics/).