Telemetry signals in operators

Since SDP 25.7.0, all Stackable operators emit telemetry data in the following ways:

Console logs in plain and JSON format
File logs in JSON format (with the option of Rolling files)
OpenTelemetry logs exported via OTLP
OpenTelemetry traces exported via OTLP

Every subscriber can be toggled and customized using Helm values. All fields are grouped under the top-level telemetry section.

The following sections describe the available fields as well as their default and supported values. If the Helm values explained below are not overridden, the following operator defaults apply:

Levels for all signals are set to INFO.
Console logs are enabled
File logs are disabled
File logs rotation period is set to Never
File logs max files is unset
OpenTelemetry logs and traces are disabled
OTLP endpoints are set to http://localhost:4317

Console logs

This signal prints log messages at the selected level and in the selected format to STDOUT. These logs are useful for quick debugging. For a more complete debugging experience, we recommend the OpenTelemetry signals.

telemetry:
  consoleLog:
    enabled: true (1)
    level: null   (2)
    format: null  (3)

1	Boolean: `true, false`
2	Enum: `error, warning, info, debug, trace`
3	Enum: `plain, json`

File logs

This signal writes log messages at the selected level in JSON to (rolling) log file(s). These logs can be picked up by a log aggregation system, like Vector.

telemetry:
  fileLog:
    enabled: false         (1)
    level: null            (2)
    rotationPeriod: hourly (3)
    maxFiles: 6            (4)

1	Boolean: `true, false`
2	Enum: `error, warning, info, debug, trace`
3	Enum: `never, daily, hourly, minutely`
4	Unsigned Integer

OpenTelemetry logs and traces

These two signal export OpenTelemetry logs and traces to OTLP enabled collectors. These signals can be visualized using tools, like Grafana, Loki, and Jaeger.

telemetry:
  otelLogExporter:
    enabled: false (1)
    level: null    (2)
    endpoint: null (3)
  otelTraceExporter:
    enabled: false (1)
    level: null    (2)
    endpoint: null (3)

1	Boolean: `true, false`
2	Enum: `error, warning, info, debug, trace`
3	String: E.g. `my-collector:4317`