opentelemetry_nova

OpenTelemetry instrumentation for the Nova web framework.

Automatic HTTP request tracing and metrics with Prometheus export support.

Installation

Add to your dependencies in rebar.config:

{deps, [
    {opentelemetry_nova, "~> 0.1"}
]}.

Setup

Call setup/0 during application startup:

opentelemetry_nova:setup().

Or with Prometheus export:

opentelemetry_nova:setup(#{prometheus => #{port => 9464}}).

Metrics

The following metrics are collected automatically:

Metric	Type	Description
http.server.request.duration	Histogram (seconds)	Request duration
http.server.active_requests	UpDown Counter	Currently active requests
http.server.request.body.size	Histogram (bytes)	Request body size
http.server.response.body.size	Histogram (bytes)	Response body size

Components

• otel_nova_stream_h - Cowboy stream handler for HTTP tracing and metrics
• otel_nova_plugin - Nova plugin for span enrichment with controller/action attributes
• otel_nova_prom_exporter - Prometheus exporter with delta-to-cumulative conversion
• otel_nova_prom_server - HTTP server for Prometheus scraping

License

Apache 2.0