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[Java] Add Performance Testing Workflow for Lambda Layer (#394)
**Issue description:**
- Added a workflow to automatically performance test and gather the
results for the unreleased Java Lambda Layer.
**The GitHub workflow does the following:**
1. Deploy and setup the Java Lambda sample application instrumented with
the Application Signals Lambda Layer on the AppSignals e2e testing aws
account.
2. Record the start time of the test and run the specified amount
(default: 20) Lambda cold start iterations on the sample application
3. Record the end time of the test
4. Query CW Logs Insights for the aggregated performance testing metrics
with the following query:
```
fields @timestamp, @message, @initDuration
| filter @message like "REPORT RequestId"
| stats
count(@initDuration) as Sample_Count,
avg(@initDuration) as Average_Init_Duration,
min(@initDuration) as Min_Init_Duration,
max(@initDuration) as Max_Init_Duration,
pct(@initDuration, 50) as P50_Init_Duration,
pct(@initDuration, 90) as P90_Init_Duration,
pct(@initDuration, 99) as P99_Init_Duration'
```
5. Parse and flatten the result from the query call and save it in a
file.
6. Clean and destroy the deployed lambda resources upon completion,
cancellation, or failure.
**Testing**
Testing was done on a personal aws dev account with the exact IAM
permissions as the e2e testing aws account.
Example of a successful job:
https://github.com/liustve/aws-application-signals-test-framework/actions/runs/14392326689
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