public void setExplicitApplicationSpec(ApplicationSpec app) {
        explicitApplication = app;
    }
Sets the application specification to include when verifying the complete routing config. This needs to be
invoked before {@link #deriveCommonSettings(com.yahoo.config.model.ConfigModelRepo)} to be included.

@param app the application specification to include
config-model/src/main/java/com/yahoo/vespa/model/routing/Routing.java