diff --git a/poetry.lock b/poetry.lock
index d059fb19..371c6bc0 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.8.2 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.8.3 and should not be changed by hand.
 
 [[package]]
 name = "anyio"
@@ -2039,6 +2039,20 @@ files = [
 dev = ["pre-commit", "tox"]
 testing = ["pytest", "pytest-benchmark"]
 
+[[package]]
+name = "prometheus-client"
+version = "0.20.0"
+description = "Python client for the Prometheus monitoring system."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "prometheus_client-0.20.0-py3-none-any.whl", hash = "sha256:cde524a85bce83ca359cc837f28b8c0db5cac7aa653a588fd7e84ba061c329e7"},
+    {file = "prometheus_client-0.20.0.tar.gz", hash = "sha256:287629d00b147a32dcb2be0b9df905da599b2d82f80377083ec8463309a4bb89"},
+]
+
+[package.extras]
+twisted = ["twisted"]
+
 [[package]]
 name = "proto-plus"
 version = "1.23.0"
@@ -3454,4 +3468,4 @@ dev = ["doc8", "flake8", "flake8-import-order", "rstcheck[sphinx]", "sphinx"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11"
-content-hash = "7501cd3e6328fc7532cfbfa041d47d561c1fcc911f8329f208e98e9a4ad9be98"
+content-hash = "5325a4e0733da3dd5eaf698284abbb3665247697ecd8518cb570a5ffef951b85"
diff --git a/pyproject.toml b/pyproject.toml
index 6888928d..7e693f81 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,6 +27,7 @@ rq-scheduler = "^0.13.1"
 pyvmomi = "^8.0.2.0.1"
 vapi-runtime = { url = "https://raw.githubusercontent.com/vmware/vsphere-automation-sdk-python/v8.0.1.0/lib/vapi-runtime/vapi_runtime-2.40.0-py2.py3-none-any.whl" }
 vcenter-bindings = { url = "https://raw.githubusercontent.com/vmware/vsphere-automation-sdk-python/v8.0.1.0/lib/vcenter-bindings/vcenter_bindings-4.1.0-py2.py3-none-any.whl" }
+prometheus-client = "^0.20.0"
 
 
 [tool.poetry.group.docs]
diff --git a/runner_manager/main.py b/runner_manager/main.py
index e4b15e59..808be460 100644
--- a/runner_manager/main.py
+++ b/runner_manager/main.py
@@ -8,7 +8,14 @@
 from runner_manager import Runner, RunnerGroup, Settings, log
 from runner_manager.dependencies import get_queue, get_redis, get_settings
 from runner_manager.jobs.startup import startup
-from runner_manager.routers import _health, private, public, runner_groups, webhook
+from runner_manager.routers import (
+    _health,
+    metrics,
+    private,
+    public,
+    runner_groups,
+    webhook,
+)
 
 settings = get_settings()
 log.setLevel(settings.log_level)
@@ -39,6 +46,7 @@ async def lifespan(app: FastAPI):
 app.include_router(private.router)
 app.include_router(public.router)
 app.include_router(runner_groups.router)
+app.include_router(metrics.router)
 
 
 @app.get("/")
diff --git a/runner_manager/routers/metrics.py b/runner_manager/routers/metrics.py
new file mode 100644
index 00000000..78feb34b
--- /dev/null
+++ b/runner_manager/routers/metrics.py
@@ -0,0 +1,22 @@
+from typing import List
+
+from fastapi import APIRouter
+from fastapi.responses import PlainTextResponse
+from prometheus_client import Gauge, generate_latest
+
+from runner_manager import RunnerGroup
+from runner_manager.models.runner import Runner
+
+router = APIRouter(prefix="/metrics")
+
+runners_count = Gauge("runners_count", "Number of runners", ["runner_group"])
+
+
+@router.get("/", response_class=PlainTextResponse)
+def compute_metrics() -> PlainTextResponse:
+    groups: List[RunnerGroup] = RunnerGroup.find().all()
+    for group in groups:
+        runners: List[Runner] = group.get_runners()
+        runners_count.labels(runner_group=group.name).set(len(runners))
+    metrics = generate_latest().decode()
+    return PlainTextResponse(content=metrics)
diff --git a/tests/api/test_metrics.py b/tests/api/test_metrics.py
new file mode 100644
index 00000000..b3eb367b
--- /dev/null
+++ b/tests/api/test_metrics.py
@@ -0,0 +1,65 @@
+from fastapi.testclient import TestClient
+
+from runner_manager import RunnerGroup
+from runner_manager.clients.github import GitHub
+
+
+def test_metrics_endpoint(client: TestClient, runner_group: RunnerGroup):
+    runner_group.save()
+    response = client.get("/metrics")
+    assert response.status_code == 200
+    runner_lines = [
+        line for line in response.text.splitlines() if line.startswith("runners_")
+    ]
+    assert f'runners_count{{runner_group="{runner_group.name}"}} 0.0' in runner_lines
+
+
+def test_runner_count(client: TestClient, runner_group: RunnerGroup, github: GitHub):
+    runner_group.save()
+    want = len(runner_group.get_runners())
+
+    response = client.get("/metrics")
+    assert response.status_code == 200
+    got = [line for line in response.text.splitlines() if line.startswith("runners_")]
+    print(want)
+    assert f'runners_count{{runner_group="{runner_group.name}"}} {want:.1f}' in got
+
+    runner_group.max = 2
+    runner_group.min = 1
+    runner_group.save()
+
+    want = 0.0
+    response = client.get("/metrics")
+    assert response.status_code == 200
+    before = [
+        line for line in response.text.splitlines() if line.startswith("runners_")
+    ]
+    assert f'runners_count{{runner_group="{runner_group.name}"}} {want:.1f}' in before
+
+    runner = runner_group.create_runner(github)
+    assert runner is not None
+
+    want = 1.0
+    response = client.get("/metrics")
+    assert response.status_code == 200
+    after_create = [
+        line for line in response.text.splitlines() if line.startswith("runners_")
+    ]
+    assert (
+        f'runners_count{{runner_group="{runner_group.name}"}} {want:.1f}'
+        in after_create
+    )
+
+    runner = runner_group.delete_runner(runner, github)
+    assert runner is not None
+
+    want = 0.0
+    response = client.get("/metrics")
+    assert response.status_code == 200
+    after_delete = [
+        line for line in response.text.splitlines() if line.startswith("runners_")
+    ]
+    assert (
+        f'runners_count{{runner_group="{runner_group.name}"}} {want:.1f}'
+        in after_delete
+    )