Traefik proxy logs with OpenTelemetry

Collect Traefik access logs — routing decisions, backend responses, and latency — with the OpenTelemetry Collector. The same Collector can also forward traces and metrics from your apps — see Connect OpenTelemetry Collector to Bronto.

Prerequisites

A Bronto account and API key (how to create one)
Traefik writing access logs to a file in JSON format (Traefik logs to stdout by default — see below)
An OpenTelemetry Collector (recommended) or Fluent Bit installed on the same host

Enable a JSON access log in traefik.yaml:

traefik.yaml

accessLog:
  filePath: /var/log/traefik/access.log
  format: json

Configure the Collector

Traefik’s JSON access log is one object per line — parse it with json_parser:

/etc/otel/config.yaml

receivers:
  filelog/traefik:
    include:
      - /var/log/traefik/access.log
    operators:
      - type: json_parser
    resource:
      service.name: traefik
      service.namespace: <YOUR_COLLECTION_NAME>

processors:
  batch:

exporters:
  otlphttp/brontologs:
    logs_endpoint: "https://ingestion.<REGION>.bronto.io/v1/logs"
    compression: gzip
    headers:
      x-bronto-api-key: <YOUR_API_KEY>

service:
  pipelines:
    logs:
      receivers: [filelog/traefik]
      processors: [batch]
      exporters: [otlphttp/brontologs]

Set <REGION> to eu or us.

What you will see in Bronto

Open Search and filter by service.name = traefik. Each entry carries the client address (ClientHost), entrypoint, router and service names, method (RequestMethod), path (RequestPath), status (DownstreamStatus), duration (Duration), and backend URL. The JSON fields map directly to searchable attributes.

Troubleshooting

No log file? Traefik logs to stdout unless accessLog.filePath is set. Add the accessLog block above and set format: json for automatic field extraction.
For general issues, see OTel Collector troubleshooting.

Alternative: Fluent Bit

If you already run Fluent Bit, tail the Traefik access log and forward it over HTTP:

fluent-bit.conf

[INPUT]
    name  tail
    path  /var/log/traefik/access.log
    tag   traefik

[OUTPUT]
    name        http
    match       traefik
    host        ingestion.<REGION>.bronto.io
    port        443
    tls         on
    format      json_lines
    compress    gzip
    header      x-bronto-api-key    <YOUR_API_KEY>
    header      x-bronto-dataset    traefik
    header      x-bronto-collection <YOUR_COLLECTION_NAME>

Set Format to json_lines, not json. See Connect Fluent Bit to Bronto for installation.

Overview

Ingest with agents

Ingest from AWS

Ingest from Azure

Ingest from CDN and edge

Ingest from apps and platforms

Ingest from infrastructure and databases

Ingest OpenTelemetry data

Traefik proxy logs with OpenTelemetry

Prerequisites

Configure the Collector

What you will see in Bronto

Troubleshooting

Alternative: Fluent Bit

​Prerequisites

​Configure the Collector

​What you will see in Bronto

​Troubleshooting

​Alternative: Fluent Bit

Prerequisites

Configure the Collector

What you will see in Bronto

Troubleshooting

Alternative: Fluent Bit