Update docs

Author: Nadine-H

docs/docs/guides/metrics.md

@@ -2,7 +2,7 @@
 
 ## Prometheus
 
-To collect and export fleet and run metrics to Prometheus, enable the
+To collect and export fleet and run as well as server health metrics to Prometheus, enable the
 `DSTACK_ENABLE_PROMETHEUS_METRICS` environment variable and configure Prometheus to fetch metrics from
 `<dstack server URL>/metrics`.
 
@@ -140,3 +140,21 @@ telemetry, and more.
     | `dstack_run_type`     | *string*  | Run configuration type | `task`, `dev-environment`              |
     | `dstack_backend`      | *string*  | Backend                | `aws`, `runpod`                        |
     | `dstack_gpu`          | *string?* | GPU name               | `H100`                                 |
+
+### Server health metrics
+
+These are operational metrics to monitor the health of the dstack server. For now, these only include HTTP metrics, but more will be added later.
+
+=== "Metrics"
+    | Name                                     | Type      | Description                       | Examples     |
+    |------------------------------------------|-----------|-----------------------------------|--------------|
+    | `dstack_server_requests_total` | *counter* | Total number of HTTP requests | `100.0` |
+    | `dstack_server_request_duration_seconds` | *histogram*   | HTTP request duration in seconds  | `1.0`|
+
+=== "Labels"
+    | Name                   | Type      | Description   | Examples                               |
+    |------------------------|-----------|:--------------|----------------------------------------|
+    | `method`  | *string*  | HTTP method  | `POST`                                 |
+    | `endpoint`    | *string* | Endpoint path    | `/api/project/main/repos/get`                             |
+    | `http_status`      | *string* | HTTP status code      | `200` |
+    | `project_name` | *string?*  | Project name  | `main`                           |

pyproject.toml

@@ -35,7 +35,6 @@ dependencies = [
     "gpuhunt==0.1.6",
     "argcomplete>=3.5.0",
     "ignore-python>=0.2.0",
-    "prometheus-fastapi-instrumentator>=7.1.0",
 ]
 
 [project.urls]