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Remote sensors provide information about the remote calls made in an application. These sensors enable tracking of the remote calls and combing interactions between JVMs in a single trace. There are two types of remote sensors: server and client. Server ones are dealing with server-side requests, while client ones are capturing the client-side requestsClient-side remote sensor start a new tracing span before making an outgoing request and propagate the new span identification along with that request. Server-side implementations first extract a span identification from an incoming request and continuing or starting a trace from that point. Note that in remote communication one JVM can usually stand as both server (receiving requests) and client (making requests to another JVM/component).
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The following table provides all currently available remote sensors
Remote Sensor | Type | Technology | Library / Framework | Description |
|---|---|---|---|---|
Remote HTTP Java Server Sensor | Server | HTTP | Java Servlet API (version 2.x & up) | Intercepts server requests served with Java Servlet API. |
| Remote Apache HTTP Client Sensor | Client | HTTP | Apache HttpComponents Client (version 4.x) | Intercepts client requests made with Apache HTTP Client. Compatible with all 4.x versions. |
| Remote Jetty HTTP Client Sensor | Client | HTTP | Jetty Http Client (versions 6.x, 7.x & 8.x) | Intercepts client requests made with Jetty HTTP Client. Compatible with versions 6.x, 7.x & 8.x. Not compatible with latest versions of Jetty Client. |
| Remote URL Connection Client Sensor | Client | HTTP | Java URL Connection (Java 6+) | Intercepts client requests made with Java URL connection. Independent of Java version used. |
| Remote Spring Template Client Sensor | Client | HTTP | Spring Template (version 3.x & 4.x) | Intercepts client requests made with Spring RestTemplate wrapper. Helpful if you use Spring RestTemplate with a Netty, OkHttp or Async Apache HTTP client as underlying request factory. |
| Remote JMS Listener Server Sensor | Server | JMS | Java Message Service API (version 1.x & up) | Intercepts JMS message receiving via Message Listener. |
| Remote JMS Client Sensor | Client | JMS | Java Message Service API (version 1.x & up) | Intercepts JMS message sending via Message Producer. |
| Remote Manual Server Sensor | Server | - | - | Intercepts server requests independent of technology and library/framework. Useful to mark custom trace start points, for example at the begging of the batch job. |