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This is a .NET 6 web api that reads NATS client metrics from the /connz endpoint and show Prometheus formatted metrics per client connection.

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NATS Client Metrics

This is something to run inside Docker, Podman or Kubernetes (k8s) to gather client specific connection metrics for NATS. It will show the server and the client connected and for each, print out the Prometheus based metrics strings along with the help information.

I purposely did this with a /metrics web API in .NET Core without the heavy running of the Metrics middleware. I only needed this data so did the minimal listing required just for this reason. This I did for my OpenRMF application so I could see which client was the busiest, had the most messages, most bytes, per client and not just the server as a whole.

Currently, it works inside a k8s namespace for non-exposed Prometheus as well as a localized Docker Compose or Podman-Compose setup.

Build

make build

Make a Docker images

make docker

Available Docker Image: https://hub.docker.com/r/cingulara/nats-client-metrics

Run in Docker or Kubernetes

There is a URL below that is in the NATSMETRICSURL environment variable to launch with this. The default is localhost which in Docker/K8s world means "itself" which won't work. Make sure you update the URL environment variable to match the metrics endpoint.

"NATSMETRICSURL" : "http://127.0.0.1:8222"
"ASPNETCORE_ENVIRONMENT": "Development"
"ASPNETCORE_URLS": "http://*:7778"

Grafana Dashboard Definition

The Dashboard JSON can be imported into Grafana and pointed to the Prometheus data source to view this information.

Image

Example Output

# HELP Total Messages Incoming for this client.
# TYPE gnatds_clients_in_msgs_total gauge
gnatds_clients_in_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_controls"} 0
# HELP Total Messages Outgoing for this client.
# TYPE gnatds_clients_out_msgs_total gauge
gnatds_clients_out_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_controls"} 0
# HELP Total Pending Bytes for this client.
# TYPE gnatds_clients_pending_bytes_total gauge
gnatds_clients_pending_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_controls"} 0
# HELP Total Bytes Incoming for this client.
# TYPE gnatds_clients_in_bytes_total gauge
gnatds_clients_in_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_controls"} 0
# HELP Total Bytes Outgoing for this client.
# TYPE gnatds_clients_out_bytes_total gauge
gnatds_clients_out_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_controls"} 0
# HELP Total Subscriptions for this client.
# TYPE gnatds_clients_subscriptions_total gauge
gnatds_clients_subscriptiosn_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_controls"} 2
# HELP Total Messages Incoming for this client.
# TYPE gnatds_clients_in_msgs_total gauge
gnatds_clients_in_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_audit"} 0
# HELP Total Messages Outgoing for this client.
# TYPE gnatds_clients_out_msgs_total gauge
gnatds_clients_out_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_audit"} 0
# HELP Total Pending Bytes for this client.
# TYPE gnatds_clients_pending_bytes_total gauge
gnatds_clients_pending_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_audit"} 0
# HELP Total Bytes Incoming for this client.
# TYPE gnatds_clients_in_bytes_total gauge
gnatds_clients_in_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_audit"} 0
# HELP Total Bytes Outgoing for this client.
# TYPE gnatds_clients_out_bytes_total gauge
gnatds_clients_out_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_audit"} 0
# HELP Total Subscriptions for this client.
# TYPE gnatds_clients_subscriptions_total gauge
gnatds_clients_subscriptiosn_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_audit"} 1
# HELP Total Messages Incoming for this client.
# TYPE gnatds_clients_in_msgs_total gauge
gnatds_clients_in_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_checklist"} 0
# HELP Total Messages Outgoing for this client.
# TYPE gnatds_clients_out_msgs_total gauge
gnatds_clients_out_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_checklist"} 0
# HELP Total Pending Bytes for this client.
# TYPE gnatds_clients_pending_bytes_total gauge
gnatds_clients_pending_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_checklist"} 0
# HELP Total Bytes Incoming for this client.
# TYPE gnatds_clients_in_bytes_total gauge
gnatds_clients_in_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_checklist"} 0
# HELP Total Bytes Outgoing for this client.
# TYPE gnatds_clients_out_bytes_total gauge
gnatds_clients_out_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_checklist"} 0
# HELP Total Subscriptions for this client.
# TYPE gnatds_clients_subscriptions_total gauge
gnatds_clients_subscriptiosn_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_checklist"} 2
# HELP Total Messages Incoming for this client.
# TYPE gnatds_clients_in_msgs_total gauge
gnatds_clients_in_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_score"} 0
# HELP Total Messages Outgoing for this client.
# TYPE gnatds_clients_out_msgs_total gauge
gnatds_clients_out_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_score"} 0
# HELP Total Pending Bytes for this client.
# TYPE gnatds_clients_pending_bytes_total gauge
gnatds_clients_pending_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_score"} 0
# HELP Total Bytes Incoming for this client.
# TYPE gnatds_clients_in_bytes_total gauge
gnatds_clients_in_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_score"} 0
# HELP Total Bytes Outgoing for this client.
# TYPE gnatds_clients_out_bytes_total gauge
gnatds_clients_out_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_score"} 0
# HELP Total Subscriptions for this client.
# TYPE gnatds_clients_subscriptions_total gauge
gnatds_clients_subscriptiosn_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_score"} 5
# HELP Total Messages Incoming for this client.
# TYPE gnatds_clients_in_msgs_total gauge
gnatds_clients_in_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_api_save"} 0
# HELP Total Messages Outgoing for this client.
# TYPE gnatds_clients_out_msgs_total gauge
gnatds_clients_out_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_api_save"} 0
# HELP Total Pending Bytes for this client.
# TYPE gnatds_clients_pending_bytes_total gauge
gnatds_clients_pending_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_api_save"} 0
# HELP Total Bytes Incoming for this client.
# TYPE gnatds_clients_in_bytes_total gauge
gnatds_clients_in_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_api_save"} 0
# HELP Total Bytes Outgoing for this client.
# TYPE gnatds_clients_out_bytes_total gauge
gnatds_clients_out_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_api_save"} 0
# HELP Total Subscriptions for this client.
# TYPE gnatds_clients_subscriptions_total gauge
gnatds_clients_subscriptiosn_total{server_id="http://127.0.0.1:8222",clientname="openrmf_api_save"} 0
# HELP Total Messages Incoming for this client.
# TYPE gnatds_clients_in_msgs_total gauge
gnatds_clients_in_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_template"} 0
# HELP Total Messages Outgoing for this client.
# TYPE gnatds_clients_out_msgs_total gauge
gnatds_clients_out_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_template"} 0
# HELP Total Pending Bytes for this client.
# TYPE gnatds_clients_pending_bytes_total gauge
gnatds_clients_pending_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_template"} 0
# HELP Total Bytes Incoming for this client.
# TYPE gnatds_clients_in_bytes_total gauge
gnatds_clients_in_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_template"} 0
# HELP Total Bytes Outgoing for this client.
# TYPE gnatds_clients_out_bytes_total gauge
gnatds_clients_out_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_template"} 0
# HELP Total Subscriptions for this client.
# TYPE gnatds_clients_subscriptions_total gauge
gnatds_clients_subscriptiosn_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_template"} 1
# HELP Total Messages Incoming for this client.
# TYPE gnatds_clients_in_msgs_total gauge
gnatds_clients_in_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_system"} 0
# HELP Total Messages Outgoing for this client.
# TYPE gnatds_clients_out_msgs_total gauge
gnatds_clients_out_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_system"} 0
# HELP Total Pending Bytes for this client.
# TYPE gnatds_clients_pending_bytes_total gauge
gnatds_clients_pending_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_system"} 0
# HELP Total Bytes Incoming for this client.
# TYPE gnatds_clients_in_bytes_total gauge
gnatds_clients_in_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_system"} 0
# HELP Total Bytes Outgoing for this client.
# TYPE gnatds_clients_out_bytes_total gauge
gnatds_clients_out_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_system"} 0
# HELP Total Subscriptions for this client.
# TYPE gnatds_clients_subscriptions_total gauge
gnatds_clients_subscriptiosn_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_system"} 4
# HELP Total Messages Incoming for this client.
# TYPE gnatds_clients_in_msgs_total gauge
gnatds_clients_in_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_compliance"} 0
# HELP Total Messages Outgoing for this client.
# TYPE gnatds_clients_out_msgs_total gauge
gnatds_clients_out_msgs_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_compliance"} 0
# HELP Total Pending Bytes for this client.
# TYPE gnatds_clients_pending_bytes_total gauge
gnatds_clients_pending_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_compliance"} 0
# HELP Total Bytes Incoming for this client.
# TYPE gnatds_clients_in_bytes_total gauge
gnatds_clients_in_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_compliance"} 0
# HELP Total Bytes Outgoing for this client.
# TYPE gnatds_clients_out_bytes_total gauge
gnatds_clients_out_bytes_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_compliance"} 0
# HELP Total Subscriptions for this client.
# TYPE gnatds_clients_subscriptions_total gauge
gnatds_clients_subscriptiosn_total{server_id="http://127.0.0.1:8222",clientname="openrmf_msg_compliance"} 3

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This is a .NET 6 web api that reads NATS client metrics from the /connz endpoint and show Prometheus formatted metrics per client connection.

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