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Adding OpenTelemetry Metrics Docs for Newt

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---
title: "Metrics"
description: "Enable and consume OpenTelemetry & vendor specific metrics"
---
We provide metrics in the **OpenTelemetry** (OTel) format and additionally support the following vendor backends:
* **Prometheus** (native scrape and via OTel Collector)
## Why Metrics & OTel
Observability enables:
1. **Incident detection** (latency spikes, reconnect storms)
2. **Capacity planning** (bytes, active sessions)
3. **User‑experience SLAs** (p95 tunnel latency, auth latency)
4. **Faster RCA** (dimensions like `error_type`, `result`)
OpenTelemetry provides a **vendor‑neutral** pipeline so you can change backends without retouching instrumented code.
## Availability
Newt exposes metrics starting from specific releases, but metrics are disabled in their default configuration.
- Newt: metrics implemented since Newt 1.6.0 (disabled by default)
## Open Telemetry
Push metrics and traces to an **OTel Collector** or any backend that accepts OTLP.
<Tip>
If you only enable Prometheus scrape, leave `*_METRICS_OTLP_ENABLED=false` and omit OTLP vars.
</Tip>
<Note>
The OTel Collector commonly uses port <code>4317</code> for gRPC and <code>4318</code> for HTTP. Set <code>OTEL_EXPORTER_OTLP_PROTOCOL</code> to <code>http/protobuf</code> for HTTP or <code>grpc</code> for gRPC, and point <code>OTEL_EXPORTER_OTLP_ENDPOINT</code> accordingly.
For further customization, see the [OTel Collector documentation](https://opentelemetry.io/docs/collector/).
</Note>
<AccordionGroup>
<Accordion title="Newt Configuration">
<Tabs>
<Tab title="Environment Variables">
```text
NEWT_METRICS_OTLP_ENABLED=true # enable OTLP exporter
OTEL_EXPORTER_OTLP_ENDPOINT=otel-collector:4317
OTEL_EXPORTER_OTLP_INSECURE=true # or false + TLS vars
OTEL_METRIC_EXPORT_INTERVAL=15s
# Optional auth / TLS
OTEL_EXPORTER_OTLP_HEADERS=authorization=Bearer%20XYZ
OTEL_EXPORTER_OTLP_CERTIFICATE=/etc/otel/ca.pem
```
</Tab>
<Tab title="CLI Args">
```text
newt \
--metrics-otlp-enabled=true \ # alias for otel
--otel=true \
--otel-exporter-otlp-endpoint=otel-collector:4317 \
--otel-exporter-otlp-insecure=true \
--otel-metric-export-interval=15s \
--otel-exporter-otlp-headers=authorization=Bearer%20XYZ \
--otel-exporter-otlp-certificate=/etc/otel/ca.pem
```
See the [CLI reference](../../manage/sites/configure-site) for all available flags.
</Tab>
</Tabs>
</Accordion>
<Accordion title="Newt Configuration Examples">
<Tabs>
<Tab title="CLI (gRPC)">
```bash
# Enable OTLP exporters and point to your Collector's gRPC receiver.
export OTEL_EXPORTER_OTLP_ENDPOINT="http://localhost:4317"
export OTEL_EXPORTER_OTLP_PROTOCOL="grpc"
newt \
--otlp=true
--id saz281jfa8z37zg
--secret ssfdfsder33rrerrwe
--endpoint http://pangolin.example.com
```
</Tab>
<Tab title="Docker Compose">
```yaml title="docker-compose.metrics.yaml"
services:
otel-collector:
image: ghcr.io/open-telemetry/opentelemetry-collector-releases/opentelemetry-collector-contrib:latest # DO NOT use 'latest' in production
command: ["--config=/etc/otel/config.yaml"]
volumes:
- ./otel-config.yaml:/etc/otel/config.yaml:ro
ports:
- "4317:4317" # gRPC
- "4318:4318" # HTTP
- "8888:8888" # Prometheus exporter (from the Collector) - Optional
newt:
image: fosrl/newt:latest # DO NOT use 'latest' in production
environment:
NEWT_METRICS_OTLP_ENABLED: "true"
OTEL_EXPORTER_OTLP_ENDPOINT: otel-collector:4317
OTEL_EXPORTER_OTLP_INSECURE: "true"
PANGOLIN_ENDPOINT: https://example.com
NEWT_ID: heresmynewtid
NEWT_SECRET: yoursupersecretkeyhere
```
```yaml title="otel-config.yaml"
receivers:
otlp:
protocols:
grpc:
endpoint: 0.0.0.0:4317
http:
endpoint: 0.0.0.0:4318
processors: {}
# Example exporters:
exporters:
otlp:
endpoint: otel-collector:4317
insecure: true
prometheus:
endpoint: "0.0.0.0:8889"
service:
pipelines:
metrics:
receivers: [otlp]
processors: []
exporters: [prometheus]
```
Forward to Remote Write Backend
```yaml title="otel-config-remote.yaml"
exporters:
prometheusremotewrite:
endpoint: https://prom-remote.example.com/api/v1/write
headers:
X-Scope-OrgID: tenant-a
tls:
insecure_skip_verify: false
service:
pipelines:
metrics/remote:
receivers: [otlp]
processors: [batch]
exporters: [prometheusremotewrite]
```
<Note>
Combine exporters (e.g. local Prometheus + remote write) to retain fast local dashboards and ship long‑term retention externally.
</Note>
</Tab>
</Tabs>
</Accordion>
</AccordionGroup>
## Prometheus (without OTel Collector)
<AccordionGroup>
<Accordion title="Newt Configuration">
Each service listens on an admin HTTP address (example Newt default `:2112`).
<Tabs>
<Tab title="Environment Variables">
```text
NEWT_METRICS_PROMETHEUS_ENABLED=true # /metrics endpoint
NEWT_ADMIN_ADDR=:2112 # admin HTTP address
```
</Tab>
<Tab title="CLI Args">
```text
newt \
--metrics-prometheus-enabled=true \ # alias for metrics
--metrics=true
--admin-addr=:2112 \
```
See the [CLI reference](../../manage/sites/configure-site) for all available flags.
</Tab>
</Tabs>
</Accordion>
<Accordion title="Newt Configuration Examples">
<Tabs>
<Tab title="CLI">
```bash
newt \
--metrics-prometheus-enabled=true \
--admin-addr=:2112 \
--id saz281jfa8z37zg \
--secret ssfdfsder33rrerrwe \
--endpoint https://pangolin.example.com
```
</Tab>
<Tab title="Docker Compose">
```yaml title="docker-compose.metrics.yaml"
services:
newt:
image: fosrl/newt:latest # DO NOT use 'latest' in production
environment:
NEWT_METRICS_OTLP_ENABLED: "true"
OTEL_EXPORTER_OTLP_ENDPOINT: otel-collector:4317
OTEL_EXPORTER_OTLP_INSECURE: "true"
PANGOLIN_ENDPOINT: https://example.com
NEWT_ID: saz281jfa8z37zg
NEWT_SECRET: ssfdfsder33rrerrwe
```
</Tab>
<Tab title="Prometheus Scrape Config">
```yaml title="prometheus.yml (fragment)"
scrape_configs:
- job_name: pangolin
static_configs: [{ targets: ["pangolin:2112"] }]
```
</Tab>
</Tabs>
</Accordion>
</AccordionGroup>
## Full Metric Reference
**Version 1.0.0 from 2025-10-28**
Below are currently implemented metrics for **Newt**.
* **Metric**: exact metric name
* **Instrument & unit**: OTel instrument type and canonical unit
* **Purpose**: what the metric conveys / recommended use
* **Emission path**: subsystem responsible (for troubleshooting missing data)
* **Example series**: representative sample including labels
<Warning>
Names/labels can change between major versions. Avoid hard‑coding full label sets in alerts; prefer existence checks and aggregate functions.
</Warning>
### Newt metrics
<Tabs>
<Tab title="OpenTelemetry (OTel)">
<ResponseField name="newt">
OpenTelemetry metric instruments exposed by Newt. Expand each section to see individual metrics with labels, units, emission points, and examples.
<Expandable title="Site & Build">
<ResponseField name="newt_site_registrations_total" type="Counter">
Counts Pangolin registration attempts keyed by result.
<Expandable title="Details">
**Unit:** 1
**Labels:** `result` (`success`|`failure`), `site_id`
**Emission path:** `telemetry.IncSiteRegistration`
**Example:** `newt_site_registrations_total{result="success",site_id="abc"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_site_online" type="ObservableGauge">
0/1 heartbeat for the active site.
<Expandable title="Details">
**Unit:** 1
**Labels:** `site_id`
**Emission path:** `state.TelemetryView` (callback)
**Example:** `newt_site_online{site_id="self"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_site_last_heartbeat_seconds" type="ObservableGauge">
Seconds since last Pangolin heartbeat.
<Expandable title="Details">
**Unit:** seconds
**Labels:** `site_id`
**Emission path:** `TouchHeartbeat` (callback)
**Example:** `newt_site_last_heartbeat_seconds{site_id="self"} 3.2`
</Expandable>
</ResponseField>
<ResponseField name="newt_build_info" type="ObservableGauge">
Constant 1 with build metadata labels.
<Expandable title="Details">
**Unit:** 1
**Labels:** `version`, `commit`
**Emission path:** Build info registration
**Example:** `newt_build_info{version="1.2.3",commit="abc123"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_restart_count_total" type="Counter">
Process boot indicator (increments once per process start).
<Expandable title="Details">
**Unit:** 1
**Labels:** —
**Emission path:** `RegisterBuildInfo`
**Example:** `newt_restart_count_total 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_cert_rotation_total" type="Counter">
Certificate rotation events keyed by result.
<Expandable title="Details">
**Unit:** 1
**Labels:** `result`
**Emission path:** `IncCertRotation`
**Example:** `newt_cert_rotation_total{result="success"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_config_reloads_total" type="Counter">
Config reload attempts keyed by result.
<Expandable title="Details">
**Unit:** 1
**Labels:** `result`
**Emission path:** `telemetry.IncConfigReload`
**Example:** `newt_config_reloads_total{result="success"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_config_apply_seconds" type="Histogram (s)">
Duration per config-apply phase keyed by `phase` and `result`.
<Expandable title="Details">
**Unit:** seconds
**Labels:** `phase`, `result`
**Emission path:** `telemetry.ObserveConfigApply`
**Example:** `newt_config_apply_seconds_bucket{phase="peer",result="success",le="0.1"} 3`
</Expandable>
</ResponseField>
</Expandable>
<Expandable title="Tunnel">
<ResponseField name="newt_tunnel_sessions" type="ObservableGauge">
Active sessions per tunnel (or collapsed).
<Expandable title="Details">
**Unit:** 1
**Labels:** `site_id`, `tunnel_id`
**Emission path:** `RegisterStateView`
**Example:** `newt_tunnel_sessions{site_id="self",tunnel_id="wgpub"} 2`
</Expandable>
</ResponseField>
<ResponseField name="newt_tunnel_bytes_total" type="Counter (bytes)">
Traffic per tunnel, direction, and protocol.
<Expandable title="Details">
**Unit:** bytes
**Labels:** `tunnel_id`, `direction` (`ingress`|`egress`), `protocol` (`tcp`|`udp`)
**Emission path:** Proxy manager
**Example:** `newt_tunnel_bytes_total{direction="egress",protocol="tcp",tunnel_id="wgpub"} 8192`
</Expandable>
</ResponseField>
<ResponseField name="newt_tunnel_latency_seconds" type="Histogram (s)">
RTT samples per tunnel/transport.
<Expandable title="Details">
**Unit:** seconds
**Labels:** `tunnel_id`, `transport`
**Emission path:** Health checks
**Example:** `newt_tunnel_latency_seconds_bucket{transport="wireguard",le="0.05",tunnel_id="wgpub"} 4`
</Expandable>
</ResponseField>
<ResponseField name="newt_tunnel_reconnects_total" type="Counter">
Reconnect attempts keyed by initiator & reason.
<Expandable title="Details">
**Unit:** 1
**Labels:** `tunnel_id`, `initiator` (`client`|`server`), `reason`
**Emission path:** `telemetry.IncReconnect`
**Example:** `newt_tunnel_reconnects_total{initiator="client",reason="timeout",tunnel_id="wgpub"} 3`
</Expandable>
</ResponseField>
</Expandable>
<Expandable title="Connection & Auth">
<ResponseField name="newt_connection_attempts_total" type="Counter">
Auth/WebSocket connection attempts keyed by transport & result.
<Expandable title="Details">
**Unit:** 1
**Labels:** `transport`, `result`
**Emission path:** `telemetry.IncConnAttempt`
**Example:** `newt_connection_attempts_total{transport="websocket",result="failure"} 2`
</Expandable>
</ResponseField>
<ResponseField name="newt_connection_errors_total" type="Counter">
Connection errors keyed by transport and type.
<Expandable title="Details">
**Unit:** 1
**Labels:** `transport`, `error_type`
**Emission path:** `telemetry.IncConnError`
**Example:** `newt_connection_errors_total{transport="auth",error_type="auth_failed"} 1`
</Expandable>
</ResponseField>
</Expandable>
<Expandable title="WebSocket">
<ResponseField name="newt_websocket_connect_latency_seconds" type="Histogram (s)">
Dial latency for Pangolin WebSocket.
<Expandable title="Details">
**Unit:** seconds
**Labels:** `result`, `transport`
**Emission path:** `ObserveWSConnectLatency`
**Example:** `newt_websocket_connect_latency_seconds_bucket{result="success",transport="websocket",le="0.5"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_websocket_disconnects_total" type="Counter">
WebSocket disconnects keyed by reason.
<Expandable title="Details">
**Unit:** 1
**Labels:** `reason`, `tunnel_id`
**Emission path:** `IncWSDisconnect`
**Example:** `newt_websocket_disconnects_total{reason="remote_close",tunnel_id="wgpub"} 2`
</Expandable>
</ResponseField>
<ResponseField name="newt_websocket_keepalive_failures_total" type="Counter">
Ping/Pong failures observed by keepalive.
<Expandable title="Details">
**Unit:** 1
**Labels:** `reason` (e.g., `ping_write`, `pong_timeout`)
**Emission path:** `telemetry.IncWSKeepaliveFailure(ctx, "ping_write")`
**Example:** `newt_websocket_keepalive_failures_total{reason="ping_write"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_websocket_session_duration_seconds" type="Histogram (s)">
Duration of established WS sessions keyed by result.
<Expandable title="Details">
**Unit:** seconds
**Labels:** `result` (`success`|`error`)
**Emission path:** `telemetry.ObserveWSSessionDuration(ctx, time.Since(start).Seconds(), "error")`
**Example:** `newt_websocket_session_duration_seconds_bucket{result="error",le="60"} 3`
</Expandable>
</ResponseField>
<ResponseField name="newt_websocket_connected" type="ObservableGauge">
Current WS connection state (0/1).
<Expandable title="Details">
**Unit:** 1
**Labels:** —
**Emission path:** `telemetry.SetWSConnectionState(true|false)`
**Example:** `newt_websocket_connected 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_websocket_reconnects_total" type="Counter">
WebSocket reconnect attempts keyed by reason.
<Expandable title="Details">
**Unit:** 1
**Labels:** `reason`
**Emission path:** `telemetry.IncWSReconnect(ctx, "ping_write")`
**Example:** `newt_websocket_reconnects_total{reason="ping_write"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_websocket_messages_total" type="Counter">
In/out WS messages keyed by direction & type.
<Expandable title="Details">
**Unit:** 1
**Labels:** `direction` (`in`|`out`), `msg_type` (`ping`|`pong`|`text`|...)
**Emission path:** `IncWSMessage`
**Example:** `newt_websocket_messages_total{direction="out",msg_type="ping"} 4`
</Expandable>
</ResponseField>
</Expandable>
<Expandable title="Proxy">
<ResponseField name="newt_proxy_active_connections" type="ObservableGauge">
Active TCP/UDP proxy connections per tunnel/protocol.
<Expandable title="Details">
**Unit:** 1
**Labels:** `protocol`, `tunnel_id`
**Emission path:** Proxy callback
**Example:** `newt_proxy_active_connections{protocol="tcp",tunnel_id="wgpub"} 3`
</Expandable>
</ResponseField>
<ResponseField name="newt_proxy_buffer_bytes" type="ObservableGauge (bytes)">
Proxy buffer pool size.
<Expandable title="Details">
**Unit:** bytes
**Labels:** `protocol`, `tunnel_id`
**Emission path:** Proxy callback
**Example:** `newt_proxy_buffer_bytes{protocol="tcp",tunnel_id="wgpub"} 10240`
</Expandable>
</ResponseField>
<ResponseField name="newt_proxy_async_backlog_bytes" type="ObservableGauge (bytes)">
Unflushed async byte backlog.
<Expandable title="Details">
**Unit:** bytes
**Labels:** `protocol`, `tunnel_id`
**Emission path:** Proxy callback
**Example:** `newt_proxy_async_backlog_bytes{protocol="udp",tunnel_id="wgpub"} 4096`
</Expandable>
</ResponseField>
<ResponseField name="newt_proxy_drops_total" type="Counter">
Proxy write drops keyed by protocol/tunnel.
<Expandable title="Details">
**Unit:** 1
**Labels:** `protocol`, `tunnel_id`
**Emission path:** `IncProxyDrops`
**Example:** `newt_proxy_drops_total{protocol="udp",tunnel_id="wgpub"} 2`
</Expandable>
</ResponseField>
<ResponseField name="newt_proxy_accept_total" type="Counter">
Proxy accept events keyed by result/reason.
<Expandable title="Details">
**Unit:** 1
**Labels:** `tunnel_id`, `protocol`, `result`, `reason`
**Emission path:** `telemetry.IncProxyAccept(ctx, tunnelID, "tcp", "failure", "timeout")`
**Example:** `newt_proxy_accept_total{protocol="tcp",result="failure",reason="timeout"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_proxy_connections_total" type="Counter">
Lifecycle events (opened/closed) per connection.
<Expandable title="Details">
**Unit:** 1
**Labels:** `tunnel_id`, `protocol`, `event` (`opened`|`closed`)
**Emission path:** `telemetry.IncProxyConnectionEvent(ctx, tunnelID, "tcp", telemetry.ProxyConnectionOpened)`
**Example:** `newt_proxy_connections_total{protocol="tcp",event="opened"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_proxy_connection_duration_seconds" type="Histogram (s)">
Duration of completed proxy connections.
<Expandable title="Details">
**Unit:** seconds
**Labels:** `tunnel_id`, `protocol`, `result`
**Emission path:** `telemetry.ObserveProxyConnectionDuration(ctx, tunnelID, "tcp", "success", seconds)`
**Example:** `newt_proxy_connection_duration_seconds_bucket{protocol="tcp",result="success",le="1"} 3`
</Expandable>
</ResponseField>
</Expandable>
</ResponseField>
</Tab>
<Tab title="Prometheus">
<ResponseField name="newt">
Prometheus-style series for the same Newt metrics. Names, labels, and examples mirror the OTel tab.
<Expandable title="Site & Build">
<ResponseField name="newt_site_registrations_total" type="counter">
Counts Pangolin registration attempts keyed by result.
<Expandable title="Details">
**Labels:** `result`, `site_id` • **Unit:** 1 • **Path:** `telemetry.IncSiteRegistration`
**Example:** `newt_site_registrations_total{result="success",site_id="abc"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_site_online" type="gauge">
0/1 heartbeat for the active site.
<Expandable title="Details">
**Labels:** `site_id` • **Unit:** 1 • **Path:** `state.TelemetryView`
**Example:** `newt_site_online{site_id="self"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_site_last_heartbeat_seconds" type="gauge">
Seconds since last Pangolin heartbeat.
<Expandable title="Details">
**Labels:** `site_id` • **Unit:** seconds • **Path:** `TouchHeartbeat`
**Example:** `newt_site_last_heartbeat_seconds{site_id="self"} 3.2`
</Expandable>
</ResponseField>
<ResponseField name="newt_build_info" type="gauge">
Constant 1 with build metadata labels.
<Expandable title="Details">
**Labels:** `version`, `commit` • **Unit:** 1 • **Path:** Build info registration
**Example:** `newt_build_info{version="1.2.3",commit="abc123"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_restart_count_total" type="counter">
Process boot indicator (increments once).
<Expandable title="Details">
**Labels:** — • **Unit:** 1 • **Path:** `RegisterBuildInfo`
**Example:** `newt_restart_count_total 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_cert_rotation_total" type="counter">
Certificate rotation events keyed by result.
<Expandable title="Details">
**Labels:** `result` • **Unit:** 1 • **Path:** `IncCertRotation`
**Example:** `newt_cert_rotation_total{result="success"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_config_reloads_total" type="counter">
Config reload attempts keyed by result.
<Expandable title="Details">
**Labels:** `result` • **Unit:** 1 • **Path:** `telemetry.IncConfigReload`
**Example:** `newt_config_reloads_total{result="success"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_config_apply_seconds" type="histogram">
Duration per config-apply phase & result.
<Expandable title="Details">
**Labels:** `phase`, `result` • **Unit:** seconds • **Path:** `telemetry.ObserveConfigApply`
**Example:** `newt_config_apply_seconds_bucket{phase="peer",result="success",le="0.1"} 3`
</Expandable>
</ResponseField>
</Expandable>
<Expandable title="Tunnel">
<ResponseField name="newt_tunnel_sessions" type="gauge">
Active sessions per tunnel (or collapsed).
<Expandable title="Details">
**Labels:** `site_id`, `tunnel_id` • **Unit:** 1 • **Path:** `RegisterStateView`
**Example:** `newt_tunnel_sessions{site_id="self",tunnel_id="wgpub"} 2`
</Expandable>
</ResponseField>
<ResponseField name="newt_tunnel_bytes_total" type="counter">
Traffic per tunnel/direction/protocol.
<Expandable title="Details">
**Labels:** `tunnel_id`, `direction`, `protocol` • **Unit:** bytes • **Path:** Proxy manager
**Example:** `newt_tunnel_bytes_total{direction="egress",protocol="tcp",tunnel_id="wgpub"} 8192`
</Expandable>
</ResponseField>
<ResponseField name="newt_tunnel_latency_seconds" type="histogram">
RTT samples per tunnel/transport.
<Expandable title="Details">
**Labels:** `tunnel_id`, `transport` • **Unit:** seconds • **Path:** Health checks
**Example:** `newt_tunnel_latency_seconds_bucket{transport="wireguard",le="0.05",tunnel_id="wgpub"} 4`
</Expandable>
</ResponseField>
<ResponseField name="newt_tunnel_reconnects_total" type="counter">
Reconnect attempts by initiator & reason.
<Expandable title="Details">
**Labels:** `tunnel_id`, `initiator`, `reason` • **Unit:** 1 • **Path:** `telemetry.IncReconnect`
**Example:** `newt_tunnel_reconnects_total{initiator="client",reason="timeout",tunnel_id="wgpub"} 3`
</Expandable>
</ResponseField>
</Expandable>
<Expandable title="Connection & Auth">
<ResponseField name="newt_connection_attempts_total" type="counter">
Auth/WebSocket attempts by transport & result.
<Expandable title="Details">
**Labels:** `transport`, `result` • **Unit:** 1 • **Path:** `telemetry.IncConnAttempt`
**Example:** `newt_connection_attempts_total{transport="websocket",result="failure"} 2`
</Expandable>
</ResponseField>
<ResponseField name="newt_connection_errors_total" type="counter">
Connection errors by transport and type.
<Expandable title="Details">
**Labels:** `transport`, `error_type` • **Unit:** 1 • **Path:** `telemetry.IncConnError`
**Example:** `newt_connection_errors_total{transport="auth",error_type="auth_failed"} 1`
</Expandable>
</ResponseField>
</Expandable>
<Expandable title="WebSocket">
<ResponseField name="newt_websocket_connect_latency_seconds" type="histogram">
Dial latency for Pangolin WebSocket.
<Expandable title="Details">
**Labels:** `result`, `transport` • **Unit:** seconds • **Path:** `ObserveWSConnectLatency`
**Example:** `newt_websocket_connect_latency_seconds_bucket{result="success",transport="websocket",le="0.5"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_websocket_disconnects_total" type="counter">
WS disconnects by reason.
<Expandable title="Details">
**Labels:** `reason`, `tunnel_id` • **Unit:** 1 • **Path:** `IncWSDisconnect`
**Example:** `newt_websocket_disconnects_total{reason="remote_close",tunnel_id="wgpub"} 2`
</Expandable>
</ResponseField>
<ResponseField name="newt_websocket_keepalive_failures_total" type="counter">
Keepalive Ping/Pong failures.
<Expandable title="Details">
**Labels:** `reason` • **Unit:** 1 • **Path:** `telemetry.IncWSKeepaliveFailure(ctx, "ping_write")`
**Example:** `newt_websocket_keepalive_failures_total{reason="ping_write"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_websocket_session_duration_seconds" type="histogram">
Duration of established WebSocket sessions by result.
<Expandable title="Details">
**Labels:** `result` • **Unit:** seconds • **Path:** `telemetry.ObserveWSSessionDuration(...)`
**Example:** `newt_websocket_session_duration_seconds_bucket{result="error",le="60"} 3`
</Expandable>
</ResponseField>
<ResponseField name="newt_websocket_connected" type="gauge">
Current WS connection status (0/1).
<Expandable title="Details">
**Labels:** — • **Unit:** 1 • **Path:** `telemetry.SetWSConnectionState(true|false)`
**Example:** `newt_websocket_connected 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_websocket_reconnects_total" type="counter">
Reconnect attempts by reason.
<Expandable title="Details">
**Labels:** `reason` • **Unit:** 1 • **Path:** `telemetry.IncWSReconnect(ctx, "ping_write")`
**Example:** `newt_websocket_reconnects_total{reason="ping_write"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_websocket_messages_total" type="counter">
In/out WS messages by direction & type.
<Expandable title="Details">
**Labels:** `direction`, `msg_type` • **Unit:** 1 • **Path:** `IncWSMessage`
**Example:** `newt_websocket_messages_total{direction="out",msg_type="ping"} 4`
</Expandable>
</ResponseField>
</Expandable>
<Expandable title="Proxy">
<ResponseField name="newt_proxy_active_connections" type="gauge">
Active TCP/UDP proxy connections per tunnel/protocol.
<Expandable title="Details">
**Labels:** `protocol`, `tunnel_id` • **Unit:** 1 • **Path:** Proxy callback
**Example:** `newt_proxy_active_connections{protocol="tcp",tunnel_id="wgpub"} 3`
</Expandable>
</ResponseField>
<ResponseField name="newt_proxy_buffer_bytes" type="gauge">
Proxy buffer pool size.
<Expandable title="Details">
**Labels:** `protocol`, `tunnel_id` • **Unit:** bytes • **Path:** Proxy callback
**Example:** `newt_proxy_buffer_bytes{protocol="tcp",tunnel_id="wgpub"} 10240`
</Expandable>
</ResponseField>
<ResponseField name="newt_proxy_async_backlog_bytes" type="gauge">
Unflushed async byte backlog.
<Expandable title="Details">
**Labels:** `protocol`, `tunnel_id` • **Unit:** bytes • **Path:** Proxy callback
**Example:** `newt_proxy_async_backlog_bytes{protocol="udp",tunnel_id="wgpub"} 4096`
</Expandable>
</ResponseField>
<ResponseField name="newt_proxy_drops_total" type="counter">
Proxy write drops per protocol/tunnel.
<Expandable title="Details">
**Labels:** `protocol`, `tunnel_id` • **Unit:** 1 • **Path:** `IncProxyDrops`
**Example:** `newt_proxy_drops_total{protocol="udp",tunnel_id="wgpub"} 2`
</Expandable>
</ResponseField>
<ResponseField name="newt_proxy_accept_total" type="counter">
Proxy accept events by result/reason.
<Expandable title="Details">
**Labels:** `tunnel_id`, `protocol`, `result`, `reason` • **Unit:** 1 • **Path:** `telemetry.IncProxyAccept(...)`
**Example:** `newt_proxy_accept_total{protocol="tcp",result="failure",reason="timeout"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_proxy_connections_total" type="counter">
Connection lifecycle events (opened/closed).
<Expandable title="Details">
**Labels:** `tunnel_id`, `protocol`, `event` • **Unit:** 1 • **Path:** `telemetry.IncProxyConnectionEvent(...)`
**Example:** `newt_proxy_connections_total{protocol="tcp",event="opened"} 1`
</Expandable>
</ResponseField>
<ResponseField name="newt_proxy_connection_duration_seconds" type="histogram">
Duration of completed proxy connections.
<Expandable title="Details">
**Labels:** `tunnel_id`, `protocol`, `result` • **Unit:** seconds • **Path:** `telemetry.ObserveProxyConnectionDuration(...)`
**Example:** `newt_proxy_connection_duration_seconds_bucket{protocol="tcp",result="success",le="1"} 3`
</Expandable>
</ResponseField>
</Expandable>
</ResponseField>
</Tab>
</Tabs>
---
## References
* <Link href="https://opentelemetry.io/docs/">OpenTelemetry Documentation</Link>
* <Link href="https://prometheus.io/docs/introduction/overview/">Prometheus Documentation</Link>
<Tip>
Have improvements or a missing metric? Open an issue or PR referencing this page.
</Tip>