Copied /node/master_healthcheck REST API reference to RS 7.8 version

Author: rrelledge

content/operate/rs/7.8/references/rest-api/requests/node_master_healthcheck/_index.md

@@ -0,0 +1,71 @@
+---
+Title: Node master healthcheck requests
+alwaysopen: false
+categories:
+- docs
+- operate
+- rs
+description: REST API requests to check a node's connection to the cluster's primary node.
+headerRange: '[1-2]'
+hideListLinks: true
+linkTitle: node/master_healthcheck
+weight: $weight
+url: '/operate/rs/7.8/references/rest-api/requests/node_master_healthcheck/'
+---
+
+| Method | Path | Description |
+|--------|------|-------------|
+| [GET](#get-node-master-healthcheck) | `/v1/local/node/master_healthcheck` | Checks a node's connection to the primary node |
+
+## Get master healthcheck {#get-node-master-healthcheck}
+
+```sh
+GET /v1/local/node/master_healthcheck
+```
+
+Checks whether the current node has a valid connection to the cluster's primary node and the Cluster Configuration Store (CCS).
+
+### Required permissions
+
+| Permission name | Roles |
+|-----------------|-------|
+| [view_cluster_info]({{< relref "/operate/rs/7.8/references/rest-api/permissions#view_cluster_info" >}}) | admin<br />cluster_member<br />cluster_viewer<br />db_member<br />db_viewer<br />user_manager |
+
+### Request {#get-request}
+
+#### Example HTTP request
+
+```sh
+GET /v1/local/node/master_healthcheck
+```
+
+
+#### Headers
+
+| Key | Value | Description |
+|-----|-------|-------------|
+| Host | cnm.cluster.fqdn | Domain name |
+| Accept | application/json | Accepted media type |
+
+
+### Response {#get-response}
+
+Returns a JSON object that includes the status of the current node's connection to the cluster's primary node and the CCS.
+
+- `active`: the current node has a valid connection.
+
+- `inactive`: the current node doesn't have a valid connection.
+
+#### Example JSON response body
+
+```json
+{
+  "status": "active"
+}
+```
+
+#### Status codes {#get-status-codes}
+
+| Code | Description |
+|------|-------------|
+| [200 OK](https://www.rfc-editor.org/rfc/rfc9110.html#name-200-ok) | No error |