overleaf/services/git-bridge/src/main/resources/logback-gke.xml

<configuration>

    <variable name="LOG_LEVEL" value="${LOG_LEVEL:-INFO}" />

    <!-- Log everything (subject to logger and root levels set below) to stdout. -->
    <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
        <target>System.out</target>
        <encoder class="net.logstash.logback.encoder.LogstashEncoder">
            <timestampPattern>yyyy-MM-dd'T'HH:mm:ss.SSSXXX</timestampPattern>
            <fieldNames>
                <timestamp>time</timestamp>
                <version>[ignore]</version>
                <message>message</message>
                <logger>logger</logger>
                <thread>thread</thread>
                <level>[ignore]</level>
                <levelValue>[ignore]</levelValue>
                <stackTrace>stack_trace</stackTrace>
            </fieldNames>
            <provider class="net.logstash.logback.composite.loggingevent.LoggingEventPatternJsonProvider">
                <pattern>{"severity":"%replace(%replace(%level){'WARN','WARNING'}){'TRACE','DEBUG'}"}</pattern>
            </provider>
            <provider class="uk.ac.ic.wlgitbridge.server.GcpLabelsJsonProvider" />
        </encoder>
    </appender>

    <!-- Log warnings and errors to stderr. We send them to a log aggregation service for monitoring. -->
    <appender name="stderr" class="ch.qos.logback.core.ConsoleAppender">
        <target>System.err</target>
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARN</level>
        </filter>
        <encoder class="net.logstash.logback.encoder.LogstashEncoder">
            <timestampPattern>yyyy-MM-dd'T'HH:mm:ss.SSSXXX</timestampPattern>
            <fieldNames>
                <timestamp>time</timestamp>
                <version>[ignore]</version>
                <message>message</message>
                <logger>logger</logger>
                <thread>thread</thread>
                <level>[ignore]</level>
                <levelValue>[ignore]</levelValue>
                <stackTrace>stack_trace</stackTrace>
            </fieldNames>
            <provider class="net.logstash.logback.composite.loggingevent.LoggingEventPatternJsonProvider">
                <pattern>{"severity":"%replace(%replace(%level){'WARN','WARNING'}){'TRACE','DEBUG'}"}</pattern>
            </provider>
            <provider class="uk.ac.ic.wlgitbridge.server.GcpLabelsJsonProvider" />
        </encoder>
    </appender>

    <!-- Set log levels for the application (or parts of the application). -->
    <logger name="uk.ac.ic.wlgitbridge" level="${LOG_LEVEL}" />

    <!-- The root log level determines how much our dependencies put in the logs. -->
    <root level="WARN">
        <appender-ref ref="stdout" />
        <appender-ref ref="stderr" />
    </root>
</configuration>