private JsonNode renderProcessingChains() {
        JsonNode ret = jsonMapper.createObjectNode();
        for (RequestHandler h : requestHandlers()) {
            if (h instanceof ProcessingHandler) {
                ChainRegistry<Processor> registry = ((ProcessingHandler) h).getChainRegistry();
                return renderChains(registry);
            }
        }
        return ret;
    }
Handler that outputs meta-info about the deployed Vespa application, and status of components and chains.

@author gjoranv
@author Einar M R Rosenvinge
@author bjorncs
container-disc/src/main/java/com/yahoo/container/handler/observability/ApplicationStatusHandler.java