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You can register a build service and then listen on a few events: https://docs.gradle.org/current/userguide/build_services.html#operation_listener (there's also

BuildListener

but it's not compatible with configuration cache, so not future-proof: https://docs.gradle.org/current/userguide/configuration_cache.html#config_cache:requirements:build_listeners)

Are services shared accross all projects or specific per-project in a milti-module build?

You register the operation completion listener on

BuildEventsListenerRegistry

which should be a build-wide registry as far as I remember. Once you add an operation completion listener to it, you should be fine. Something like

abstract class TaskFailureHandler : BuildService<BuildServiceParameters.None>, OperationCompletionListener {
    override fun onFinish(event: FinishEvent?) {
        val result = (event as? TaskFinishEvent)?.result as? TaskFailureResult ?: return
        result.failures.forEach { 
            println(it)
        }
    }
}

Thanks both. This works like a charm!