StringWriter responseJsonString = new StringWriter();
JsonGenerator responseJson = jsonFactory.createJsonGenerator(responseJsonString);
responseJson.writeStartObject();
// HystrixCommand value is an array of multiple objects; an object for each command
responseJson.writeArrayFieldStart("HystrixCommand");
for (HystrixCommandMetrics commandMetrics : HystrixCommandMetrics.getInstances()) {
responseJson.writeStartObject();
HystrixCommandKey key = commandMetrics.getCommandKey();