For example the following INFO message is displayed:

Info: "configuration.browser.actions.delete.label" finished successfully. [MORE]
The long-running action "configuration.browser.actions.delete.label" you started in the Configuration app on item "..."

Problem likely in AbstractCommandAction#executeOnItem

scheduler.addTriggerListener(new CommandActionTriggerListener(
jobName + "_trigger",
i18n.translate("ui-framework.abstractcommand.asyncaction.successTitle", getDefinition().getLabel()),
i18n.translate("ui-framework.abstractcommand.asyncaction.successMessage", getDefinition().getLabel(), appName, item.getJcrItem().getPath()),
i18n.translate("ui-framework.abstractcommand.asyncaction.errorTitle", getDefinition().getLabel()),
i18n.translate("ui-framework.abstractcommand.asyncaction.errorMessage", getDefinition().getLabel(), appName, item.getJcrItem().getPath())));
// start the job