Add documentation for retrieving Geo nodes and status via API

doc/api/README.md

@@ -20,6 +20,7 @@ following locations:
 - [Environments](environments.md)
 - [Events](events.md)
 - [Feature flags](features.md)
+- [Geo Nodes](geo_nodes.md)
 - [Gitignores templates](templates/gitignores.md)
 - [GitLab CI Config templates](templates/gitlab_ci_ymls.md)
 - [Groups](groups.md)

doc/api/geo_nodes.md

+# Geo Nodes API
+
+In order to interact with Geo node endpoints, you need to authenticate yourself
+as an admin.
+
+## Retrieve configuration about all Geo nodes
+
+```
+GET /geo_nodes
+```
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/geo_nodes
+```
+
+Example response:
+
+```json
+[
+  {
+    "id": 1,
+    "url": "https://primary.example.com/",
+    "primary": true,
+    "enabled": true,
+    "files_max_capacity": 10,
+    "repos_max_capacity": 25,
+    "clone_protocol": "ssh"
+  },
+  {
+    "id": 2,
+    "url": "https://secondary.example.com/",
+    "primary": false,
+    "enabled": true,
+    "files_max_capacity": 10,
+    "repos_max_capacity": 25,
+    "clone_protocol": "http"
+  }
+]
+```
+
+## Retrieve configuration about a specific Geo node
+
+```
+GET /geo_nodes/:id
+```
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/geo_nodes/1
+```
+
+Example response:
+
+```json
+{
+  "id": 1,
+  "url": "https://primary.example.com/",
+  "primary": true,
+  "enabled": true,
+  "files_max_capacity": 10,
+  "repos_max_capacity": 25,
+  "clone_protocol": "ssh"
+}
+```
+
+## Retrieve status about all secondary Geo nodes
+
+```
+GET /geo_nodes/status
+```
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/geo_nodes/status
+```
+
+Example response:
+
+```json
+[
+  {
+    "geo_node_id": 2,
+    "healthy": true,
+    "health": "Healthy",
+    "attachments_count": 1,
+    "attachments_synced_count": 1,
+    "attachments_failed_count": 0,
+    "attachments_synced_in_percentage": "100.00%",
+    "db_replication_lag_seconds": 0,
+    "lfs_objects_count": 0,
+    "lfs_objects_synced_count": 0,
+    "lfs_objects_failed_count": 0,
+    "lfs_objects_synced_in_percentage": "0.00%",
+    "repositories_count": 41,
+    "repositories_failed_count": 1,
+    "repositories_synced_count": 40,
+    "repositories_synced_in_percentage": "97.56%",
+    "last_event_id": 23,
+    "last_event_timestamp": 1509681166,
+    "cursor_last_event_id": 23,
+    "cursor_last_event_timestamp": 1509681166,
+    "last_successful_status_check_timestamp": 1510125024
+  }
+]
+```
+
+## Retrieve status about a specific secondary Geo node
+
+```
+GET /geo_nodes/:id/status
+```
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/geo_nodes/2/status
+```
+
+Example response:
+
+```json
+{
+  "geo_node_id": 2,
+  "healthy": true,
+  "health": "Healthy",
+  "attachments_count": 1,
+  "attachments_synced_count": 1,
+  "attachments_failed_count": 0,
+  "attachments_synced_in_percentage": "100.00%",
+  "db_replication_lag_seconds": 0,
+  "lfs_objects_count": 0,
+  "lfs_objects_synced_count": 0,
+  "lfs_objects_failed_count": 0,
+  "lfs_objects_synced_in_percentage": "0.00%",
+  "repositories_count": 41,
+  "repositories_failed_count": 1,
+  "repositories_synced_count": 40,
+  "repositories_synced_in_percentage": "97.56%",
+  "last_event_id": 23,
+  "last_event_timestamp": 1509681166,
+  "cursor_last_event_id": 23,
+  "cursor_last_event_timestamp": 1509681166,
+  "last_successful_status_check_timestamp": 1510125268
+}
+```