How deeply does Logs and Telemetry cover twelve-factor application?

Defines continuous stdout streams and environment-managed routing, then questions literal stdout-only practice without detailing the other factors.

Twelve-factor application

As explained in Logs and Telemetry

The twelve-factor app is a methodology for building software-as-a-service applications according to twelve principles covering configuration, deployment, processes, and operational behavior.

A twelve-factor application separates event production from log routing and storage. Each running process emits an unbuffered, continuous event stream; the execution environment captures, collates, routes, and archives it. section 3.3

Apply the logging principle with these operational choices:

During local development, observe the process stream directly in the foreground terminal. section 3.3
In staging and production, let the execution environment capture and route streams to files, real-time tails, archives, or analysis systems. section 3.3
Keep routing and storage outside application logic, but use a logging framework when filtering, consistent structure, adjustable detail, or targeted suppression matters. section 3.3.1

Listing 3.2 Capturing stdout

[SERVICE]
  flush 1

[INPUT]
  name stdin        #1
  tag book_stdout       #2

[OUTPUT]
  match *
  name file
  path .
  file captured.txt

A minimal Fluent Bit configuration captures standard input and writes the resulting stream to captured.txt, illustrating externalized collection and routing. section 3.3.1

How Logs and Telemetry covers it

liveBook manning.com

Read Logs and Telemetry on liveBook Get the book at manning.com

Related concepts

stdout output pluginuses · The stdout output plugin is a Fluent Bit output plugin that writes processed events to standard output.
environment variableconfigures · An environment variable is a named value supplied through an operating-system or process environment and made available to programs for runtime configuration or information.
platform as a serviceused by · Platform as a service (PaaS) is a cloud service model that provides a managed application development, deployment, or runtime platform while abstracting management of the underlying infrastructure.
stateless systemkind of · A stateless system handles each operation without relying on state retained from prior operations, though state may be maintained externally.

This explainer was generated by Manning's knowledge graph from the text of Logs and Telemetry. The section links point to the parts of the book it draws on.