Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 84“Production-grade backends”

Production Logging

Production logs are read by machines: a JSON log shape, shipped to Loki / CloudWatch / Datadog, queryable by trace ID.

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Focus

2 guided sections

Practice signal

Examples included

Career prep

Foundation builder

Introduction

Production logs are read by machines: a JSON log shape, shipped to Loki / CloudWatch / Datadog, queryable by trace ID. Plaintext logs are useless at scale.

Informative example

bash

# pom.xml
<dependency>
  <groupId>net.logstash.logback</groupId>
  <artifactId>logstash-logback-encoder</artifactId>
</dependency>

# logback-spring.xml
<configuration>
  <springProfile name="prod">
    <appender name="JSON" class="ch.qos.logback.core.ConsoleAppender">
      <encoder class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">
        <providers>
          <pattern>
            <pattern>{ "service":"${spring.application.name}",
                       "trace":"%mdc{traceId}", "span":"%mdc{spanId}" }</pattern>
          </pattern>
          <timestamp/><logLevel/><loggerName/><message/><stackTrace/>
        </providers>
      </encoder>
    </appender>
    <root level="INFO"><appender-ref ref="JSON"/></root>
  </springProfile>
</configuration>

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