Application Context 

The ApplicationContext trigger is used to show the indicators in the TYPO3 backend for a specific application context.

ext_localconf.php 
\KonradMichalik\Typo3EnvironmentIndicator\Configuration\Handler::addIndicator(
    triggers: [
        new \KonradMichalik\Typo3EnvironmentIndicator\Configuration\Trigger\ApplicationContext('Development*', 'Testing')
    ],
    indicators: [
        new \KonradMichalik\Typo3EnvironmentIndicator\Configuration\Indicator\Backend\Topbar([
            'color' => '#00ACC1',
        ]),
    ]
);
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The configuration supports multiple context names, which are separated by a comma. The context names can be prefixed with a wildcard * to match all contexts that start with the given name. For example, Development* will match all contexts that start with Development, such as Development, Development/Local, Development/DDEV, etc.