How can Environment Variable Interpolation for SENTRY_TAGS be achieved with the Sentry Logback Logging Integration in Java Spring Boot?

Question

When using environment (shell) variables, they are added and sent via the sentry logback integration.

However, there is a big caveat, they are not interpolated.

SENTRY_DSN=https://[email protected]/xxxxxx
SENTRY_TAGS=app:MyApplication,host:$HOSTNAME,project:${CI_PROJECT_NAME},branch:${CI_COMMIT_REF_NAME}
SENTRY_ENVIRONMENT=${CI_COMMIT_REF_NAME}

This happens even if these variables have a value, it will just not get replaced.

Neither $HOSTNAME nor ${CI_COMMIT_REF_NAME} will be resolved/replaced. It will result in the string just added verbatim and sent to sentry, as can be seen in the screenshot:

logback-spring.xml:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

            <appender name="Sentry" class="io.sentry.logback.SentryAppender">
                <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
                    <level>WARN</level>
                </filter>
            </appender>
            <root level="INFO">
                <!-- Log both to console(collected by SumoLogic and Cloudwatch) and Sentry -->
                <appender-ref ref="CONSOLE"/>
                <appender-ref ref="Sentry"/>
            </root>

</configuration>

This article, explains how to use the logback integration, but there is no mention of SENTRY_TAGS or other variables https://blog.sentry.io/2016/01/28/capturing-java-exceptions

There is a similar question here: Setting environment variables of Sentry dynamically for logback.xml Sentry appender