diff --git a/backend/openapi-schema.yml b/backend/openapi-schema.yml
index d3456c8c..67f1ed25 100644
--- a/backend/openapi-schema.yml
+++ b/backend/openapi-schema.yml
@@ -626,10 +626,14 @@ components:
       - name
       title: WorkerWithId
       type: object
+  securitySchemes:
+    HTTPBasic:
+      scheme: basic
+      type: http
 info:
   title: FastAPI
   version: 0.1.0
-openapi: 3.0.2
+openapi: 3.1.0
 paths:
   /:
     get:
@@ -1579,3 +1583,16 @@ paths:
                 $ref: '#/components/schemas/HTTPValidationError'
           description: Validation Error
       summary: Serve Media
+  /metrics:
+    get:
+      description: Endpoint that serves Prometheus metrics.
+      operationId: metrics_metrics_get
+      responses:
+        '200':
+          content:
+            application/json:
+              schema: {}
+          description: Successful Response
+      security:
+      - HTTPBasic: []
+      summary: Metrics
diff --git a/backend/pdm.lock b/backend/pdm.lock
index 806b7ef6..0baa4114 100644
--- a/backend/pdm.lock
+++ b/backend/pdm.lock
@@ -1,33 +1,6 @@
 # This file is @generated by PDM.
 # It is not intended for manual editing.
 
-[[package]]
-name = "aioprometheus"
-version = "23.3.0"
-requires_python = ">=3.8.0"
-git = "https://github.com/bugbakery/aioprometheus.git"
-ref = "2eaf503426eb0e71c8d4d51924a45a10f2937bec"
-revision = "2eaf503426eb0e71c8d4d51924a45a10f2937bec"
-summary = "A Prometheus Python client library for asyncio-based applications"
-dependencies = [
-    "orjson",
-    "quantile-python>=1.1",
-]
-
-[[package]]
-name = "aioprometheus"
-version = "23.3.0"
-extras = ["starlette"]
-requires_python = ">=3.8.0"
-git = "https://github.com/bugbakery/aioprometheus.git"
-ref = "2eaf503426eb0e71c8d4d51924a45a10f2937bec"
-revision = "2eaf503426eb0e71c8d4d51924a45a10f2937bec"
-summary = "A Prometheus Python client library for asyncio-based applications"
-dependencies = [
-    "aioprometheus @ git+https://github.com/bugbakery/aioprometheus.git@2eaf503426eb0e71c8d4d51924a45a10f2937bec",
-    "starlette>=0.14.2",
-]
-
 [[package]]
 name = "alembic"
 version = "1.12.1"
@@ -745,12 +718,6 @@ version = "1.26.2"
 requires_python = ">=3.9"
 summary = "Fundamental package for array computing in Python"
 
-[[package]]
-name = "orjson"
-version = "3.9.10"
-requires_python = ">=3.8"
-summary = "Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy"
-
 [[package]]
 name = "overrides"
 version = "7.4.0"
@@ -821,6 +788,16 @@ version = "0.18.0"
 requires_python = ">=3.8"
 summary = "Python client for the Prometheus monitoring system."
 
+[[package]]
+name = "prometheus-fastapi-instrumentator"
+version = "6.1.0"
+requires_python = ">=3.7.0,<4.0.0"
+summary = "Instrument your FastAPI with Prometheus metrics."
+dependencies = [
+    "fastapi<1.0.0,>=0.38.1",
+    "prometheus-client<1.0.0,>=0.8.0",
+]
+
 [[package]]
 name = "prompt-toolkit"
 version = "3.0.41"
@@ -1010,11 +987,6 @@ dependencies = [
     "packaging",
 ]
 
-[[package]]
-name = "quantile-python"
-version = "1.1"
-summary = "Python Implementation of Graham Cormode and S. Muthukrishnan's Effective Computation of Biased Quantiles over Data Streams in ICDE'05"
-
 [[package]]
 name = "referencing"
 version = "0.31.0"
@@ -1312,7 +1284,7 @@ summary = "Jupyter interactive widgets for Jupyter Notebook"
 
 [metadata]
 lock_version = "4.1"
-content_hash = "sha256:363868e5c328b6fa51f8c6c91efedc69c51f55064310127ea247dd5d7ce43eea"
+content_hash = "sha256:b9412fb0704ebdac6028e09e8e76d0e12d606505a34f92fd9a701fc9cc1a892f"
 
 [metadata.files]
 "alembic 1.12.1" = [
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 ]
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-    {url = "https://files.pythonhosted.org/packages/e8/91/db831f3bd2b66793a25c53a4642a16b6e83d4681605ac25703ddda0f7e71/orjson-3.9.10-cp39-none-win32.whl", hash = "sha256:fb0b361d73f6b8eeceba47cd37070b5e6c9de5beaeaa63a1cb35c7e1a73ef088"},
-    {url = "https://files.pythonhosted.org/packages/f3/93/3f57a2014c884f446ce8452fe5a047f090ad87cf752e3175f49f7cf21857/orjson-3.9.10-cp311-cp311-manylinux_2_17_armv7l.manylinux2014_armv7l.whl", hash = "sha256:c812312847867b6335cfb264772f2a7e85b3b502d3a6b0586aa35e1858528ab1"},
-    {url = "https://files.pythonhosted.org/packages/f8/c7/7d458f3074ddbef351d7738ab1fe8a270a18e09b8709546aab20220c3cfb/orjson-3.9.10-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:c943b35ecdf7123b2d81d225397efddf0bce2e81db2f3ae633ead38e85cd5ade"},
-    {url = "https://files.pythonhosted.org/packages/fe/24/9a747fccd553e6cf7dc849fef15793386d7b007172a44cfe004eca3c6e4f/orjson-3.9.10-cp311-cp311-musllinux_1_1_aarch64.whl", hash = "sha256:e99c625b8c95d7741fe057585176b1b8783d46ed4b8932cf98ee145c4facf499"},
-]
 "overrides 7.4.0" = [
     {url = "https://files.pythonhosted.org/packages/4d/27/30c865a1e62f1913a0730e667e94459ca038392b6f44d69ef7a585690337/overrides-7.4.0.tar.gz", hash = "sha256:9502a3cca51f4fac40b5feca985b6703a5c1f6ad815588a7ca9e285b9dca6757"},
     {url = "https://files.pythonhosted.org/packages/da/28/3fa6ef8297302fc7b3844980b6c5dbc71cdbd4b61e9b2591234214d5ab39/overrides-7.4.0-py3-none-any.whl", hash = "sha256:3ad24583f86d6d7a49049695efe9933e67ba62f0c7625d53c59fa832ce4b8b7d"},
@@ -2339,6 +2259,10 @@ content_hash = "sha256:363868e5c328b6fa51f8c6c91efedc69c51f55064310127ea247dd5d7
     {url = "https://files.pythonhosted.org/packages/35/d2/b7dc2f5d91ccfe1c64917874dc3db94b8866d0e631a55cd864ad12b275fb/prometheus_client-0.18.0.tar.gz", hash = "sha256:35f7a8c22139e2bb7ca5a698e92d38145bc8dc74c1c0bf56f25cca886a764e17"},
     {url = "https://files.pythonhosted.org/packages/aa/84/8b11274c61f81376ee06dfb5b60b176097b58166f095d55014f033632f46/prometheus_client-0.18.0-py3-none-any.whl", hash = "sha256:8de3ae2755f890826f4b6479e5571d4f74ac17a81345fe69a6778fdb92579184"},
 ]
+"prometheus-fastapi-instrumentator 6.1.0" = [
+    {url = "https://files.pythonhosted.org/packages/16/1a/8e862d92ff2aea3442a3ba5b796f3f40f14c6d0618d25ddf3c267ef41336/prometheus_fastapi_instrumentator-6.1.0-py3-none-any.whl", hash = "sha256:2279ac1cf5b9566a4c3a07f78c9c5ee19648ed90976ab87d73d672abc1bfa017"},
+    {url = "https://files.pythonhosted.org/packages/83/51/a1a81fe6996c6386885ec96a3027693f1ca5632f9de2dc61690de11273ce/prometheus_fastapi_instrumentator-6.1.0.tar.gz", hash = "sha256:1820d7a90389ce100f7d1285495ead388818ae0882e761c1f3e6e62a410bdf13"},
+]
 "prompt-toolkit 3.0.41" = [
     {url = "https://files.pythonhosted.org/packages/1f/9d/be9b01085bbd67a71c4b6aa02518fade8104e7a2224e5de5e947811d7176/prompt_toolkit-3.0.41-py3-none-any.whl", hash = "sha256:f36fe301fafb7470e86aaf90f036eef600a3210be4decf461a5b1ca8403d3cb2"},
     {url = "https://files.pythonhosted.org/packages/d9/7b/7d88d94427e1e179e0a62818e68335cf969af5ca38033c0ca02237ab6ee7/prompt_toolkit-3.0.41.tar.gz", hash = "sha256:941367d97fc815548822aa26c2a269fdc4eb21e9ec05fc5d447cf09bad5d75f0"},
@@ -2653,9 +2577,6 @@ content_hash = "sha256:363868e5c328b6fa51f8c6c91efedc69c51f55064310127ea247dd5d7
     {url = "https://files.pythonhosted.org/packages/7e/a9/2146d5117ad8a81185331e0809a6b48933c10171f5bac253c6df9fce991c/QtPy-2.4.1-py3-none-any.whl", hash = "sha256:1c1d8c4fa2c884ae742b069151b0abe15b3f70491f3972698c683b8e38de839b"},
     {url = "https://files.pythonhosted.org/packages/eb/9a/7ce646daefb2f85bf5b9c8ac461508b58fa5dcad6d40db476187fafd0148/QtPy-2.4.1.tar.gz", hash = "sha256:a5a15ffd519550a1361bdc56ffc07fda56a6af7292f17c7b395d4083af632987"},
 ]
-"quantile-python 1.1" = [
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-]
 "referencing 0.31.0" = [
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     {url = "https://files.pythonhosted.org/packages/61/11/5e947c3f2a73e7fb77fd1c3370aa04e107f3c10ceef4880c2e25ef19679c/referencing-0.31.0.tar.gz", hash = "sha256:cc28f2c88fbe7b961a7817a0abc034c09a1e36358f82fedb4ffdf29a25398863"},
diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 83e314bc..b8805275 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -21,7 +21,7 @@ dependencies = [
     "transcribee-proto @ file:///${PROJECT_ROOT}/../proto",
     "python-frontmatter>=1.0.0",
     "psycopg2>=2.9.9",
-    "aioprometheus[starlette] @ git+https://github.com/bugbakery/aioprometheus.git@2eaf503426eb0e71c8d4d51924a45a10f2937bec",
+    "prometheus-fastapi-instrumentator>=6.1.0",
 ]
 requires-python = ">=3.10"
 readme = "./README.md"
diff --git a/backend/transcribee_backend/auth.py b/backend/transcribee_backend/auth.py
index d352acd3..d87796a3 100644
--- a/backend/transcribee_backend/auth.py
+++ b/backend/transcribee_backend/auth.py
@@ -117,6 +117,11 @@ def validate_worker_authorization(session: Session, authorization: str) -> Worke
     worker = session.exec(statement).one_or_none()
     if worker is None:
         raise HTTPException(status_code=401)
+
+    worker.last_seen = now_tz_aware()
+    session.add(worker)
+    session.commit()
+
     return worker
 
 
diff --git a/backend/transcribee_backend/config.py b/backend/transcribee_backend/config.py
index 161281de..1c38a480 100644
--- a/backend/transcribee_backend/config.py
+++ b/backend/transcribee_backend/config.py
@@ -20,6 +20,9 @@ class Settings(BaseSettings):
     model_config_path: Path = Path("data/models.json")
     pages_dir: Path = Path("data/pages/")
 
+    metrics_username = "transcribee"
+    metrics_password = "transcribee"
+
 
 class ModelConfig(BaseModel):
     id: str
diff --git a/backend/transcribee_backend/main.py b/backend/transcribee_backend/main.py
index 366f6602..33467c3e 100644
--- a/backend/transcribee_backend/main.py
+++ b/backend/transcribee_backend/main.py
@@ -1,13 +1,13 @@
 import asyncio
 
-from aioprometheus.asgi.middleware import MetricsMiddleware
-from aioprometheus.asgi.starlette import metrics
-from fastapi import FastAPI
+from fastapi import Depends, FastAPI
 from fastapi.middleware.cors import CORSMiddleware
+from prometheus_fastapi_instrumentator import Instrumentator
 
 from transcribee_backend.config import settings
 from transcribee_backend.helpers.periodic_tasks import run_periodic
 from transcribee_backend.helpers.tasks import remove_expired_tokens, timeout_attempts
+from transcribee_backend.metrics import init_metrics, metrics_auth, refresh_metrics
 from transcribee_backend.routers.config import config_router
 from transcribee_backend.routers.document import document_router
 from transcribee_backend.routers.page import page_router
@@ -18,9 +18,8 @@
 from .media_storage import serve_media
 
 app = FastAPI()
-app.add_middleware(MetricsMiddleware)
-app.add_route("/metrics", metrics)
-
+Instrumentator().instrument(app).expose(app, dependencies=[Depends(metrics_auth)])
+init_metrics()
 
 origins = ["*"]
 
@@ -55,3 +54,4 @@ async def setup_periodic_tasks():
         run_periodic(timeout_attempts, seconds=min(30, settings.worker_timeout))
     )
     asyncio.create_task(run_periodic(remove_expired_tokens, seconds=60 * 60))  # 1 hour
+    asyncio.create_task(run_periodic(refresh_metrics, seconds=1))
diff --git a/backend/transcribee_backend/metrics.py b/backend/transcribee_backend/metrics.py
new file mode 100644
index 00000000..e6bff987
--- /dev/null
+++ b/backend/transcribee_backend/metrics.py
@@ -0,0 +1,128 @@
+import datetime
+import secrets
+from abc import abstractmethod
+from typing import List
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBasic, HTTPBasicCredentials
+from prometheus_client import Gauge
+from sqlmodel import Session, col, func
+
+from transcribee_backend.config import settings
+from transcribee_backend.db import SessionContextManager
+from transcribee_backend.helpers.time import now_tz_aware
+from transcribee_backend.models.document import Document
+from transcribee_backend.models.task import Task, TaskAttempt, TaskState
+from transcribee_backend.models.user import User
+from transcribee_backend.models.worker import Worker
+
+
+class Metric:
+    @abstractmethod
+    def refresh(self, session: Session):
+        pass
+
+
+class TasksInState(Metric):
+    def __init__(self):
+        self.collector = Gauge("tasks", "Number of tasks", ["state"])
+
+    def refresh(self, session: Session):
+        result = session.query(Task.state, func.count()).group_by(Task.state).all()
+        counts = {x: 0 for x in TaskState}
+        for state, count in result:
+            counts[state] = count
+        for state, count in counts.items():
+            self.collector.labels(state=state.value).set(count)
+
+
+class Workers(Metric):
+    def __init__(self):
+        self.collector = Gauge("workers", "Workers", ["group"])
+
+    def refresh(self, session: Session):
+        (result,) = session.query(func.count(Worker.id)).one()
+        self.collector.labels(group="all").set(result)
+
+        now = now_tz_aware()
+        worker_timeout_ago = now - datetime.timedelta(seconds=settings.worker_timeout)
+        (result,) = (
+            session.query(func.count(Worker.id))
+            .where(
+                col(Worker.last_seen) >= worker_timeout_ago,
+            )
+            .one()
+        )
+        self.collector.labels(group="alive").set(result)
+
+
+class Users(Metric):
+    def __init__(self):
+        self.collector = Gauge("users", "Registered users")
+
+    def refresh(self, session: Session):
+        (result,) = session.query(func.count(User.id)).one()
+        self.collector.set(result)
+
+
+class Documents(Metric):
+    def __init__(self):
+        self.collector = Gauge("documents", "Documents")
+
+    def refresh(self, session: Session):
+        (result,) = session.query(func.count(Document.id)).one()
+        self.collector.set(result)
+
+
+class Queue(Metric):
+    def __init__(self):
+        self.collector = Gauge("queue", "Queue length in seconds")
+
+    def refresh(self, session: Session):
+        (result,) = (
+            session.query(
+                func.coalesce(
+                    func.sum(
+                        Document.duration * (1 - func.coalesce(TaskAttempt.progress, 0))
+                    ),
+                    0,
+                ),
+            )
+            .join(Task, Task.document_id == Document.id)
+            .join(TaskAttempt, Task.current_attempt_id == TaskAttempt.id, isouter=True)
+            .where(col(Task.state).in_(["NEW", "ASSIGNED"]))
+        ).one()
+        self.collector.set(result)
+
+
+METRIC_CLASSES: List[type[Metric]] = [TasksInState, Workers, Users, Documents, Queue]
+METRICS: List[Metric] = []
+
+
+def refresh_metrics():
+    with SessionContextManager() as session:
+        for metric in METRICS:
+            metric.refresh(session)
+
+
+def init_metrics():
+    for klass in METRIC_CLASSES:
+        METRICS.append(klass())
+
+
+security = HTTPBasic()
+
+
+def metrics_auth(credentials: HTTPBasicCredentials = Depends(security)):
+    is_correct_username = secrets.compare_digest(
+        credentials.username.encode("utf8"), settings.metrics_username.encode("utf8")
+    )
+    is_correct_password = secrets.compare_digest(
+        credentials.password.encode("utf8"), settings.metrics_password.encode("utf8")
+    )
+    if not (is_correct_username and is_correct_password):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            headers={"WWW-Authenticate": "Basic"},
+        )
+    return credentials.username
diff --git a/frontend/src/openapi-schema.ts b/frontend/src/openapi-schema.ts
index 71cdac75..b6e81136 100644
--- a/frontend/src/openapi-schema.ts
+++ b/frontend/src/openapi-schema.ts
@@ -119,6 +119,13 @@ export interface paths {
     /** Serve Media */
     get: operations["serve_media_media__file__get"];
   };
+  "/metrics": {
+    /**
+     * Metrics
+     * @description Endpoint that serves Prometheus metrics.
+     */
+    get: operations["metrics_metrics_get"];
+  };
 }
 
 export type webhooks = Record<string, never>;
@@ -1304,4 +1311,18 @@ export interface operations {
       };
     };
   };
+  /**
+   * Metrics
+   * @description Endpoint that serves Prometheus metrics.
+   */
+  metrics_metrics_get: {
+    responses: {
+      /** @description Successful Response */
+      200: {
+        content: {
+          "application/json": unknown;
+        };
+      };
+    };
+  };
 }