The kamon-elasticsearch module brings bytecode instrumentation to trace elasticsearch requests

The kamon-elasticsearch module requires you to start your application using the AspectJ Weaver Agent. Kamon will warn you at startup if you failed to do so.

The bytecode instrumentation provided by the kamon-elasticsearch module hooks into Elasticsearch's internals to automatically start and finish segments for requests that are issued within a trace. This translates into you having metrics about how the requests you are doing are behaving.

Kamon Elasticsearch module is currently available for Scala 2.10, 2.11 and 2.12.

Supported releases and dependencies are shown below.

To get started with SBT, simply add the following to your build.sbt file:

libraryDependencies += "io.kamon" %% "kamon-elasticsearch" % "0.6.7"

The following metrics will be recorded:

• reads: a histogram that tracks the reads requests latency (Get and Search).
• writes: a histogram that tracks the writes requests latency (Index, Update, and Delete).
• slows: a simple counter with the number of measured slow requests.
• errors: a simple counter with the number of failures.

By default, the name generator bundled with the kamon-elasticsearch module will use the org.elasticsearch.action.ActionRequest class name to assign a name to the automatically generated segment (i.e GetRequest, SearchRequest, IndexRequest, etc). Currently, the only way to override that name would be to provide your own implementation of kamon.elasticsearch.ElasticsearchNameGenerator which is used to assign the segment name

Requests that take longer to execute than the configured kamon.elasticsearch.slow-query-threshold can be processed by user-defined kamon.elasticsearch.SlowRequestProcessor. The default processor logs a warning message

Requests that error can be processed by user-defined kamon.elasticsearch.ElasticsearchErrorProcessor. The default processor logs an error message

kamon {
  elasticsearch {
    slow-query-threshold = 2 seconds

    # Fully qualified name of the implementation of kamon.elasticsearch.SlowRequestProcessor.
    slow-query-processor = kamon.elasticsearch.DefaultSlowRequestProcessor

    # Fully qualified name of the implementation of kamon.elasticsearch.ElasticsearchErrorProcessor.
    elasticsearch-error-processor = kamon.elasticsearch.DefaultElasticsearchErrorProcessor

    # Fully qualified name of the implementation of kamon.elasticsearch.ElasticsearchNameGenerator that will be used for assigning names to segments.
    name-generator = kamon.elasticsearch.DefaultElasticsearchNameGenerator
  }
}