By integrating Dynatrace into your existing load testing process, you can stop broken builds in your delivery pipeline earlier.
Tag test requests and push custom events
Tag tests with HTTP headers
While executing a load test from your load testing tool of choice (JMeter, Neotys, LoadRunner, etc) each simulated HTTP request can be tagged with additional HTTP headers that contain test-transaction information (for example, script name, test step name, and virtual user ID). Dynatrace can analyze incoming HTTP headers and extract such contextual information from the header values and tag the captured requests with request attributes. Request attributes enable you to filter your monitoring data based on defined tags.
You can use any (or multiple) HTTP headers or HTTP parameters to pass context information. The extraction rules can be configured via Settings > Server-side service monitoring > Request attributes.
x-dynatrace-test is used in the following examples with the following set of key/value pairs for the header:
|VU||Virtual User ID of the unique user who sent the request.|
|SI||Source ID identifies the product that triggered the request (JMeter, LoadRunner, Neotys, or other)|
|TSN||Test Step Name is a logical test step within your load testing script (for example,
|LSN||Load Script Name - name of the load testing script. This groups a set of test steps that make up a multi-step transaction (for example, an online purchase).|
|LTN||The Load Test Name uniquely identifies a test execution (for example,
|PC||Page Context provides information about the document that is loaded in the currently processed page.|
Push custom events
When running a load test, you can push additional context information to Dynatrace using the custom event API. A custom annotation then appears in the Events section on all overview pages of the entities that are defined in the API call (see example below).
Load test events are also displayed on associated services pages (see example below).
Push load testing metrics to Dynatrace
You can also push specific metrics from your load testing tool (throughput, user load, etc.) to Dynatrace via the custom metrics API.
Compare & analyze
There are different ways to analyze the data. Your approach should be based on the type of performance analysis you want to do (for example, crashes, resource and performance hotspots, or scalability issues). Following is an overview of some useful approaches you can follow to analyze your load tests. Of course, any Dynatrace analysis and diagnostic function can be used as well.
Once you've tagged requests with relevant HTTP headers, you can use the defined request attributes to filter your monitoring data based on the request attributes you've defined.
You can also define a web-request naming rule based on request attributes to easily access the monitoring data of the load tests. For example, you can define a naming rule on the test step name (For example,
TSN in our example below).
As a result, this rule creates a separate trackable request for each test step. Because request naming rules produce distinct service requests, each request is independently baselined and monitored for performance anomalies. If you've marked requests as key requests, these requests will be separately accessible via the Dynatrace Metrics API v1 endpoint.
Dynatrace allows you to use data captured via request attributes to build your own custom analysis charts. You'll find the section called
Multidimensional analysis views on each service overview page. This is useful for monitoring the evolution of your load tests overtime. In the example below we've charted response time for each test step name.
Compare view enables you to compare critical service-request metrics (Response time, Failures, CPU, and Load) between two load tests.
Response time analysis and Failure analysis views can be used to better understand performance changes in detail.
The top web requests diagnostic tool can be used to analyze the top web requests across all services. Use the request attributes you've defined to filter the load test requests.
The Metrics API v1 enables you to pull data for specific entities (processes, services, service methods, etc) and feed it into the tools that you use to determine when a build pipeline should be stopped.
The Problem API deliver metrics and details about problems that Dynatrace detects during load tests.
If you run your load test in a production environment and don't want to negatively influence your overall service and application baselines, it's a good idea to define your maintenance windows before performing any load testing. Using maintenance windows during load testing ensures that any load spikes, longer-than-usual response times, or increased error rates won’t negatively influence your overall baselining.
Alternatively, if you have a dedicated load testing environment and want to leverage the problem detection during load tests, you shouldn't use maintenance windows during load test execution.