Inspect test results
When running a cloud test, Grafana Cloud stores the test metrics generated by the k6 instances running the test. Grafana Cloud k6 provides views that visualize, analyze, and present trends for the test results.
This topic describes the primary sections of the Test Result view, also known as Test Run view.
Navigate to the Test Result view
You can navigate to the Test Result view from different flows. From the project view:
- Select the test that want to view its test run results.
- On the Test view, select the test run from the Test Runs table.
The Performance Overview section displays high-level data for your test. While the test runs, it displays live metrics.
Indicators of good and bad results
The first sign of a good or bad result is usually in the Performance Overview panel.
Typical signs of a good result:
- Response time has a flat trend for the duration of the test.
- Request rates follow the same ramping pattern as Virtual Users (if VUs increase, so does the request rate).
Typical signs of a performance issue or bottleneck:
- Response times rise during the test.
- Response times rise, then quickly bottom out and stay flat.
- Request rates do not rise with VUs (and response times start to increase).
This is a non-exhaustive list. You should use these patterns as a first indicator of good or bad performance of your test.
Below the Performance overview panel, the Performance Insights section lists any issues that the cloud service algorithms detect. Read more on Performance Insights.
Inspect request data: HTTP, WebSocket, or gRPC
Each HTTP, WebSocket, or gRPC data provides information about the originated k6 request and the response from the system under test (SUT). The response data gives performance information, such as latency and error, about how the system behaves during the test execution.
You might want to inspect the requests by different metrics to analyze the test results. For example:
- slowest requests.
- most failed requests.
- behavior at a specific period.
If you want to visualize or analyze HTTP request results, click the HTTP tab:
The WebSocket and gRPC tabs are available if your test run contains requests towards a WebSocket or a gRPC service, respectively. Otherwise, they are inaccessible.
To inspect a request in detail:
- Select its row.
- In the expanded row, inspect the:
- Additional metrics for the request.
- Options to change the aggregation.
- To see HTTP metrics from a specific load zone, use the drop down.
Inspect test data
On the Results tab, you can dig into the specific result from your k6 t4ests:
- Thresholds: list the Thresholds generated by the test run in the order defined in your script.
- Checks: list the Checks generated by the test run, organized into Groups (if used).
- Logs: list the logs generated by the test run.
To visually inspect and analyze Thresholds, click the Threshold tab.
First, check the number of failed thresholds. You should analyze failed thresholds to fix the underlying issues on your system or customize the Threshold settings.
To find failing thresholds, use the search bar. You can filter by name or by pass/fail status.
Search for one or multiple names, like
From your filters, find which thresholds. For example,
Note the red or green markings on the left side of each row.
To see visualizations for the metric, select the threshold and inspect the graph.
To visually inspect and analyze Checks, click the Checks tab.
First, analyze the number of checks that passed against the total number of checks. This provides a quick overview of the check status.
To find failed checks, search for a check or sort columns.
- Note the red or green on the left side of each row.
- In the preceding image, the Check
HTTP status is 200succeeded only 84.57% of the time: 137 successful runs and 25 failures.
To inspect a check in detail:
- Select the Check row.
- In the expanded check, note how many failures occur at different points in the test.
Logging messages can help you debug load tests. The k6 API supports the following console-logging methods:
console.debug(): output the logs only when running k6 with the
Tip: Debug locally first
First, run your test locally
k6 run my-test.jsfor testing and debugging. When your script is ready, execute the cloud test with the
With the Logs Tab, you can view, filter, and query log messages in the Cloud Results page.
To filter messages by severity:
- Use the Log level dropdown.
The load-zone filter displays only when your test runs in more than one load zone.