private static ApplicationInstanceReference parseInstanceId(String instanceIdString) {
        try {
            return parseApplicationInstanceReference(instanceIdString);
        } catch (IllegalArgumentException e) {
            throw new RestApiException.BadRequest(e.getMessage(), e);
        }
    }
Provides a read-only API for looking into the current state as seen by the Orchestrator.
This API can be unstable and is not meant to be used programmatically.

@author andreer
@author Oyvind Bakksjo
@author bjorncs
orchestrator/src/main/java/com/yahoo/vespa/orchestrator/resources/InstanceRequestHandler.java