This extension emits druid metrics to [OpenTSDB](https://github.com/OpenTSDB/opentsdb) over HTTP (Using `Jersey client`). And this emitter only emits service metric events to OpenTSDB (See [Druid metrics](../../operations/metrics.html) for a list of metrics).
|`druid.emitter.opentsdb.consumeDelay`|Queue consuming delay(in milliseconds). Actually, we use `ScheduledExecutorService` to schedule consuming events, so this `consumeDelay` means the delay between the termination of one execution and the commencement of the next. If your druid processes produce metric events fast, then you should decrease this `consumeDelay` or increase the `maxQueueSize`.|no|10000|
|`druid.emitter.opentsdb.metricMapPath`|JSON file defining the desired metrics and dimensions for every Druid metric|no|./src/main/resources/defaultMetrics.json|
### Druid to OpenTSDB Event Converter
The opentsdb emitter will send only the desired metrics and dimensions which is defined in a JSON file.
If the user does not specify their own JSON file, a default file is used. All metrics are expected to be configured in the JSON file. Metrics which are not configured will be logged.
Desired metrics and dimensions is organized using the following schema:`<druidmetricname> : [ <dimensionlist> ]`<br/>