Add opt-in Prometheus metrics endpoint for connector health

[leandropineda]

Summary

This MR builds on top of inorbit-ai/edge-sdk-python#93

Adds an opt-in Prometheus metrics endpoint to the connector framework, gated by a new MetricsConfig block in ConnectorConfig. When enabled, the connector exposes /metrics over HTTP and writes a file_sd-format discovery file so a host-side OTEL collector can find every connector on the host.

Bumps inorbit-edge[video,telemetry]>=2.1 (uses the new setup_prometheus_meter_provider, get_meter, with_counter_metric and attrs_from_self helpers from edge-sdk).

What's included

• Framework signals out of the box: process up, MQTT session connected (per robot), execution-loop ticks and errors.
• Inherited per-robot publish counters from inorbit-edge 2.1.
• Examples updated to show how to add domain metrics (API requests/errors, per-robot data updates).
• Reference OTEL collector compose + config under docs/deployment/.
• New "Metrics" user guide linked from the docs.

Demo

For example fleet connector:

$ curl localhost:9091/metrics
# HELP python_gc_objects_collected_total Objects collected during gc
# TYPE python_gc_objects_collected_total counter
python_gc_objects_collected_total{generation="0"} 4733.0
python_gc_objects_collected_total{generation="1"} 756.0
python_gc_objects_collected_total{generation="2"} 20.0
# HELP python_gc_objects_uncollectable_total Uncollectable objects found during GC
# TYPE python_gc_objects_uncollectable_total counter
python_gc_objects_uncollectable_total{generation="0"} 0.0
python_gc_objects_uncollectable_total{generation="1"} 0.0
python_gc_objects_uncollectable_total{generation="2"} 0.0
# HELP python_gc_collections_total Number of times this generation was collected
# TYPE python_gc_collections_total counter
python_gc_collections_total{generation="0"} 146.0
python_gc_collections_total{generation="1"} 13.0
python_gc_collections_total{generation="2"} 1.0
# HELP python_info Python platform information
# TYPE python_info gauge
python_info{implementation="CPython",major="3",minor="12",patchlevel="3",version="3.12.3"} 1.0
# HELP process_virtual_memory_bytes Virtual memory size in bytes.
# TYPE process_virtual_memory_bytes gauge
process_virtual_memory_bytes 5.120118784e+09
# HELP process_resident_memory_bytes Resident memory size in bytes.
# TYPE process_resident_memory_bytes gauge
process_resident_memory_bytes 8.650752e+07
# HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
# TYPE process_start_time_seconds gauge
process_start_time_seconds 1.77757964945e+09
# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
# TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 13.239999999999998
# HELP process_open_fds Number of open file descriptors.
# TYPE process_open_fds gauge
process_open_fds 18.0
# HELP process_max_fds Maximum number of open file descriptors.
# TYPE process_max_fds gauge
process_max_fds 1024.0
# HELP target_info Target metadata
# TYPE target_info gauge
target_info{inorbit_connector_id="example-fleet",inorbit_connector_type="example_bot",service_instance_id="example-fleet",service_name="inorbit_connector",service_version="2.2.0",telemetry_sdk_language="python",telemetry_sdk_name="opentelemetry",telemetry_sdk_version="1.41.1"} 1.0
# HELP inorbit_connector_example_bot_fleet_api_requests_total HTTP calls to the fleet manager API (attribute: endpoint)
# TYPE inorbit_connector_example_bot_fleet_api_requests_total counter
inorbit_connector_example_bot_fleet_api_requests_total{endpoint="telemetry"} 2748.0
inorbit_connector_example_bot_fleet_api_requests_total{endpoint="system_stats"} 1378.0
inorbit_connector_example_bot_fleet_api_requests_total{endpoint="robot_status"} 1378.0
# HELP inorbit_connector_example_bot_robot_updates_received_total Data points received from the fleet API, fanned out per robot (attributes: endpoint, robot_id)
# TYPE inorbit_connector_example_bot_robot_updates_received_total counter
inorbit_connector_example_bot_robot_updates_received_total{endpoint="robot_status",robot_id="fleet-robot-1"} 1378.0
inorbit_connector_example_bot_robot_updates_received_total{endpoint="robot_status",robot_id="fleet-robot-2"} 1378.0
inorbit_connector_example_bot_robot_updates_received_total{endpoint="robot_status",robot_id="fleet-robot-3"} 1378.0
inorbit_connector_example_bot_robot_updates_received_total{endpoint="telemetry",robot_id="fleet-robot-1"} 2748.0
inorbit_connector_example_bot_robot_updates_received_total{endpoint="telemetry",robot_id="fleet-robot-2"} 2748.0
inorbit_connector_example_bot_robot_updates_received_total{endpoint="telemetry",robot_id="fleet-robot-3"} 2748.0
inorbit_connector_example_bot_robot_updates_received_total{endpoint="system_stats",robot_id="fleet-robot-1"} 1378.0
inorbit_connector_example_bot_robot_updates_received_total{endpoint="system_stats",robot_id="fleet-robot-2"} 1378.0
inorbit_connector_example_bot_robot_updates_received_total{endpoint="system_stats",robot_id="fleet-robot-3"} 1378.0
# HELP inorbit_connector_calls_publish_system_stats_total number of calls to publish system stats
# TYPE inorbit_connector_calls_publish_system_stats_total counter
inorbit_connector_calls_publish_system_stats_total{robot_id="fleet-robot-1"} 2747.0
inorbit_connector_calls_publish_system_stats_total{robot_id="fleet-robot-2"} 2747.0
inorbit_connector_calls_publish_system_stats_total{robot_id="fleet-robot-3"} 2747.0
# HELP inorbit_connector_calls_publish_map_total number of calls to publish maps
# TYPE inorbit_connector_calls_publish_map_total counter
inorbit_connector_calls_publish_map_total{robot_id="fleet-robot-1"} 1.0
inorbit_connector_calls_publish_map_total{robot_id="fleet-robot-2"} 1.0
inorbit_connector_calls_publish_map_total{robot_id="fleet-robot-3"} 1.0
# HELP inorbit_connector_calls_publish_pose_total number of calls to publish poses
# TYPE inorbit_connector_calls_publish_pose_total counter
inorbit_connector_calls_publish_pose_total{robot_id="fleet-robot-1"} 2747.0
inorbit_connector_calls_publish_pose_total{robot_id="fleet-robot-2"} 2747.0
inorbit_connector_calls_publish_pose_total{robot_id="fleet-robot-3"} 2746.0
# HELP inorbit_connector_calls_publish_odometry_total number of calls to publish odometry
# TYPE inorbit_connector_calls_publish_odometry_total counter
inorbit_connector_calls_publish_odometry_total{robot_id="fleet-robot-1"} 2747.0
inorbit_connector_calls_publish_odometry_total{robot_id="fleet-robot-2"} 2747.0
inorbit_connector_calls_publish_odometry_total{robot_id="fleet-robot-3"} 2746.0
# HELP inorbit_connector_calls_publish_key_values_total number of calls to publish key-values
# TYPE inorbit_connector_calls_publish_key_values_total counter
inorbit_connector_calls_publish_key_values_total{robot_id="fleet-robot-1"} 2747.0
inorbit_connector_calls_publish_key_values_total{robot_id="fleet-robot-2"} 2747.0
inorbit_connector_calls_publish_key_values_total{robot_id="fleet-robot-3"} 2746.0
# HELP inorbit_connector_inorbit_connector_execution_loop_ticks_total Successful iterations of the connector's _execution_loop
# TYPE inorbit_connector_inorbit_connector_execution_loop_ticks_total counter
inorbit_connector_inorbit_connector_execution_loop_ticks_total 2747.0
# HELP inorbit_connector_inorbit_connector_up 1 while the connector main thread is alive
# TYPE inorbit_connector_inorbit_connector_up gauge
inorbit_connector_inorbit_connector_up 1.0
# HELP inorbit_connector_inorbit_connector_session_connected Per-robot MQTT session connection status (1 = connected, 0 = disconnected). Captures the case where the connector process is alive but its MQTT link to InOrbit is down.
# TYPE inorbit_connector_inorbit_connector_session_connected gauge
inorbit_connector_inorbit_connector_session_connected{robot_id="fleet-robot-1"} 1.0
inorbit_connector_inorbit_connector_session_connected{robot_id="fleet-robot-2"} 1.0
inorbit_connector_inorbit_connector_session_connected{robot_id="fleet-robot-3"} 1.0
# HELP inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds The duration of the collect operation of the metric reader.
# TYPE inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds histogram
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="0.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 0.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="5.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="10.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="25.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="50.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="75.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="100.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="250.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="500.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="750.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="1000.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="2500.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="5000.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="7500.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="10000.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="+Inf",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_count{otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 4.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_sum{otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 0.001539573015179485

For example robot connector:

$ curl localhost:9090/metrics
# HELP python_gc_objects_collected_total Objects collected during gc
# TYPE python_gc_objects_collected_total counter
python_gc_objects_collected_total{generation="0"} 445.0
python_gc_objects_collected_total{generation="1"} 54.0
python_gc_objects_collected_total{generation="2"} 20.0
# HELP python_gc_objects_uncollectable_total Uncollectable objects found during GC
# TYPE python_gc_objects_uncollectable_total counter
python_gc_objects_uncollectable_total{generation="0"} 0.0
python_gc_objects_uncollectable_total{generation="1"} 0.0
python_gc_objects_uncollectable_total{generation="2"} 0.0
# HELP python_gc_collections_total Number of times this generation was collected
# TYPE python_gc_collections_total counter
python_gc_collections_total{generation="0"} 140.0
python_gc_collections_total{generation="1"} 12.0
python_gc_collections_total{generation="2"} 1.0
# HELP python_info Python platform information
# TYPE python_info gauge
python_info{implementation="CPython",major="3",minor="12",patchlevel="3",version="3.12.3"} 1.0
# HELP process_virtual_memory_bytes Virtual memory size in bytes.
# TYPE process_virtual_memory_bytes gauge
process_virtual_memory_bytes 4.951564288e+09
# HELP process_resident_memory_bytes Resident memory size in bytes.
# TYPE process_resident_memory_bytes gauge
process_resident_memory_bytes 8.6556672e+07
# HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
# TYPE process_start_time_seconds gauge
process_start_time_seconds 1.77758247407e+09
# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
# TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 3.19
# HELP process_open_fds Number of open file descriptors.
# TYPE process_open_fds gauge
process_open_fds 12.0
# HELP process_max_fds Maximum number of open file descriptors.
# TYPE process_max_fds gauge
process_max_fds 1024.0
# HELP target_info Target metadata
# TYPE target_info gauge
target_info{inorbit_connector_id="my-example-robot",inorbit_connector_type="example_bot",service_instance_id="my-example-robot",service_name="inorbit_connector",service_version="2.2.0",telemetry_sdk_language="python",telemetry_sdk_name="opentelemetry",telemetry_sdk_version="1.41.1"} 1.0
# HELP inorbit_connector_example_bot_api_requests_total Calls made to the example bot API (attribute: endpoint)
# TYPE inorbit_connector_example_bot_api_requests_total counter
inorbit_connector_example_bot_api_requests_total{endpoint="telemetry"} 6.0
inorbit_connector_example_bot_api_requests_total{endpoint="system_stats"} 11.0
# HELP inorbit_connector_calls_publish_system_stats_total number of calls to publish system stats
# TYPE inorbit_connector_calls_publish_system_stats_total counter
inorbit_connector_calls_publish_system_stats_total{robot_id="my-example-robot"} 5.0
# HELP inorbit_connector_calls_publish_map_total number of calls to publish maps
# TYPE inorbit_connector_calls_publish_map_total counter
inorbit_connector_calls_publish_map_total{robot_id="my-example-robot"} 1.0
# HELP inorbit_connector_calls_publish_pose_total number of calls to publish poses
# TYPE inorbit_connector_calls_publish_pose_total counter
inorbit_connector_calls_publish_pose_total{robot_id="my-example-robot"} 5.0
# HELP inorbit_connector_calls_publish_odometry_total number of calls to publish odometry
# TYPE inorbit_connector_calls_publish_odometry_total counter
inorbit_connector_calls_publish_odometry_total{robot_id="my-example-robot"} 5.0
# HELP inorbit_connector_inorbit_connector_execution_loop_ticks_total Successful iterations of the connector's _execution_loop
# TYPE inorbit_connector_inorbit_connector_execution_loop_ticks_total counter
inorbit_connector_inorbit_connector_execution_loop_ticks_total 5.0
# HELP inorbit_connector_inorbit_connector_up 1 while the connector main thread is alive
# TYPE inorbit_connector_inorbit_connector_up gauge
inorbit_connector_inorbit_connector_up 1.0
# HELP inorbit_connector_inorbit_connector_session_connected Per-robot MQTT session connection status (1 = connected, 0 = disconnected). Captures the case where the connector process is alive but its MQTT link to InOrbit is down.
# TYPE inorbit_connector_inorbit_connector_session_connected gauge
inorbit_connector_inorbit_connector_session_connected{robot_id="my-example-robot"} 1.0
# HELP inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds The duration of the collect operation of the metric reader.
# TYPE inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds histogram
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="0.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 0.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="5.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="10.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="25.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="50.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="75.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="100.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="250.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="500.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="750.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="1000.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="2500.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="5000.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="7500.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="10000.0",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_bucket{le="+Inf",otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_count{otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 1.0
inorbit_connector_otel_sdk_metric_reader_collection_duration_seconds_sum{otel_component_name="prometheus_http_text_metric_exporter/1",otel_component_type="prometheus_http_text_metric_exporter"} 0.00039046595338732004

[Copilot]

Pull request overview

Adds an opt-in Prometheus metrics subsystem to the connector framework (via ConnectorConfig.metrics), including a /metrics HTTP endpoint plus Prometheus file_sd discovery output so host-side collectors can automatically find connector instances.

Changes:

• Introduces MetricsConfig in ConnectorConfig and wires framework-level OTEL/Prometheus setup + a metrics HTTP server into the connector lifecycle.
• Adds framework health instruments (up/session connected/execution loop ticks+errors) and updates examples to demonstrate connector-specific metrics.
• Adds docs and deployment references (OTEL collector compose/config) and bumps inorbit-edge dependency to include telemetry.

Reviewed changes

Copilot reviewed 27 out of 27 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_models.py	Adds unit tests for MetricsConfig defaults/validation and ConnectorConfig.metrics default.
tests/test_metrics_setup.py	Tests Prometheus meter provider setup behavior and resource attributes.
tests/test_metrics_server.py	Tests /metrics serving and file_sd discovery file lifecycle/atomic writes.
tests/test_metrics_instruments.py	Verifies framework instruments are exposed and callable.
tests/test_connector_metrics.py	Integration-ish test covering connector metrics server lifecycle and default-disabled behavior.
pyproject.toml	Bumps inorbit-edge dependency to include telemetry extras.
inorbit_connector/models.py	Adds MetricsConfig model and embeds it into ConnectorConfig.
inorbit_connector/metrics/__init__.py	Implements Prometheus/OTEL setup, metrics HTTP server + discovery writer, and framework instruments.
inorbit_connector/connector.py	Wires metrics setup/instruments into connector init + start/stop + execution loop counters.
examples/robot-connector/robot.py	Demonstrates domain metrics via with_counter_metric + error counters.
examples/robot-connector/metrics.py	Defines example robot connector meter + API request/error counters.
examples/fleet-connector/metrics.py	Defines example fleet connector meter + bulk API and per-robot fan-out counters.
examples/fleet-connector/fleet_client.py	Instruments fleet API wrapper methods and per-robot update counters.
examples/example.yaml	Adds metrics: config block example (robot connector).
examples/example.fleet.yaml	Adds metrics: config block example (fleet connector).
examples/example.env	Adds extra env vars used by examples.
examples/README.md	Documents how to run/scrape metrics from the examples.
docs/sphinx/usage/metrics.md	Adds Sphinx page that includes the metrics user guide content.
docs/sphinx/usage/index.md	Links the new Metrics page in Sphinx usage index.
docs/deployment/otel-collector-config.yaml	Reference OTEL collector config using Prometheus file_sd_configs.
docs/deployment/otel-collector-compose.yaml	Reference docker-compose for running an OTEL collector alongside connectors.
docs/deployment/README.md	Deployment guide for scraping/exporting connector metrics on a host.
docs/contents/usage/metrics.md	New end-user metrics guide (signals, config, cardinality guidance, examples).
docs/contents/usage/index.md	Adds Metrics link to docs usage index.
docs/contents/index.md	Adds Metrics entry to top-level docs index.
docs/contents/configuration.md	Documents ConnectorConfig.metrics and adds a MetricsConfig reference section.
README.md	Mentions optional Prometheus metrics as a built-in framework capability.

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