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Set thresholds
Define pass/fail criteria based on performance metrics
Set thresholds to automatically flag regressions when metrics exceed acceptable limits.
Want to fail a test the moment a critical threshold is breached? Enable fail-on-breach to stop a load test mid-execution as soon as a threshold is violated, saving VU hours and giving you faster feedback. See Fail a load test on threshold breach.
You can scope a threshold to a scenario in Browser Load Tests only, because multiple scenarios exist only in browser tests. On API Load Tests, a threshold applies globally or to specific requests, not to a scenario.
Depending on your preferred method, select any one of the following to set thresholds:
Set thresholds
In Step 3/3: Load Configuration, open the Thresholds tab. BrowserStack marks the test as failed if any threshold condition is not met.
To add a threshold:
- Select Add Threshold.
- Choose a metric, set a condition such as is greater than, and enter a value.
- Keep the scope set to All Requests to evaluate the metric across the entire test run. To apply a threshold to specific requests, a pattern, a group, or an individual scenario, see Set thresholds for specific requests.
- Repeat for more thresholds as needed, then save the test.
Available metrics:
- Total requests (count)
- Error % (percentage)
- Error count (count)
- Avg request rate (req/s)
- Avg response time (ms)
- p90 response time (ms)
- p75 LCP (s)
- p75 INP (ms)
- p75 FCP (s)
- p75 TTFB (ms)
- p75 CLS
Set thresholds
Use thresholds to determine test pass or fail based on metrics.
Available Metric list and corresponding keys for load testing:
- Avg. response time -
avg-response-time - p90 response time -
p90-response-time - Avg. request rate -
avg-request-rate - Total requests -
total-requests - Error % -
error-percentage - Error count -
error-count - p75 LCP-
p75-lcp - p75 FCP-
p75-fcp - p75 INP-
p75-inp - p75 CLS-
p75-cls - p75 TTFB -
p75-ttfb
Available conditions:
=!=><>=<=
We assume the following units for the metrics:
- Avg. response time, p90 response time, INP, TTFB -
ms - Avg. request rate -
reqs/s - Error % -
% - FCP, LCP -
s - Total requests, Error count, CLS - no unit
thresholds:
- metric: avg-response-time
condition: '>='
threshold: 20
- metric: error-percentage
condition: '<='
threshold: 5
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Contact our Support team for immediate help while we work on improving our docs.
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