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Make a change to prevent false positive background app starts. #7274

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Merged
merged 15 commits into from
Aug 20, 2025

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tejasd
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@tejasd tejasd commented Aug 19, 2025

Added a change in AppStartTrace to prevent false positives of a background app start on API 34+ devices.

See #5920

Verified locally:

2025-08-20 10:34:51.283 18373-18373 AppMonDemo              com.tdeshpande.appmontester          D  mainThreadRunnable.run(): activityCreated = false
2025-08-20 10:34:51.292 18373-18373 AppMonDemo              com.tdeshpande.appmontester          D  onActivityPreCreated: mainThreadRunnableRun = true
2025-08-20 10:34:51.294 18373-18373 AppMonDemo              com.tdeshpande.appmontester          D  onActivityCreated: mainThreadRunnableRun = true
2025-08-20 10:34:51.314 18373-18373 AppMonDemo              com.tdeshpande.appmontester          D  onActivityStarted: mainThreadRunnableRun = true
2025-08-20 10:34:51.318 18373-18373 FirebasePerformance     com.tdeshpande.appmontester          I  Firebase Performance Monitoring is successfully initialized! In a minute, visit the Firebase console to view your data: 
2025-08-20 10:34:51.319 18373-18373 FirebasePerformance     com.tdeshpande.appmontester          D  onResume(): com.tdeshpande.appmontester.MainActivity: 74362 microseconds
2025-08-20 10:34:51.320 18373-18373 AppMonDemo              com.tdeshpande.appmontester          D  onActivityResumed: mainThreadRunnableRun = true
2025-08-20 10:34:51.323 18373-18431 FirebasePerformance     com.tdeshpande.appmontester          I  Logging trace metric: _as (duration: 74.362ms). In a minute, visit the Firebase console to view your data: 

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github-actions bot commented Aug 19, 2025

Javadoc Changes:
--- /home/runner/diff/original/reports/problems/problems-report.html	2025-08-20 14:40:54.178775537 +0000
+++ /home/runner/diff/modified/reports/problems/problems-report.html	2025-08-20 14:38:46.602368857 +0000
@@ -650,7 +650,7 @@
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 // end-report-data
 );}
 </script>

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Summary of Changes

Hello @tejasd, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where Firebase Performance Monitoring was reporting false positive background app starts. The changes introduce a more robust mechanism to verify if an app truly started from the background by timing the execution of a specific runnable. If this runnable executes too quickly (within 100 milliseconds) before any activity lifecycle callbacks, it's now considered a false positive, and the background start flag is reset, preventing inaccurate performance data.

Highlights

  • New Constant for Timing: A new constant MAX_BACKGROUND_THREAD_DELAY (100ms) was introduced to define a time threshold for determining if a background app start is a false positive.
  • Timing Mechanism: A mainThreadRunnableTime field was added to record the exact time when the StartFromBackgroundRunnable is executed, which is crucial for the new timing-based logic.
  • False Positive Prevention Logic: A new isStartedFromBackground() method was implemented. This method now intelligently determines if an app truly started from the background by checking if the StartFromBackgroundRunnable fired too quickly (within MAX_BACKGROUND_THREAD_DELAY) before any activity lifecycle events, indicating a false positive.
  • Lifecycle Integration: All relevant activity lifecycle callback methods (onActivityCreated, onActivityStarted, onActivityResumed, onActivityPaused, onAppEnteredForeground, onAppEnteredBackground) were updated to use the new isStartedFromBackground() method, ensuring consistent and accurate background start detection across the app's lifecycle.
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Code Review

This pull request introduces a fix to prevent false positive detections of background app starts. The issue stems from a race condition where a runnable meant to detect background starts could execute just before the first activity's lifecycle callbacks, leading to an incorrect classification.

The fix involves introducing a small delay threshold. When checking for a background start, if the background-start flag was set very recently (less than 100ms ago), it's considered a false positive and corrected. This is achieved by:

  • Recording the execution time of the background-check runnable.
  • Creating a new method isStartedFromBackground() that encapsulates the correction logic.
  • Updating all call sites to use this new method.

The changes look solid and effectively address the race condition. I have one suggestion regarding the naming of the new method to improve code clarity and maintainability.

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google-oss-bot commented Aug 19, 2025

Coverage Report 1

Affected Products

  • firebase-perf

    Overall coverage changed from 70.78% (c85227e) to 70.83% (9e18d2a) by +0.05%.

    FilenameBase (c85227e)Merge (9e18d2a)Diff
    AppStartTrace.java77.55%78.66%+1.11%

Test Logs

  1. https://storage.googleapis.com/firebase-sdk-metric-reports/YuOKCaSlK6.html

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google-oss-bot commented Aug 19, 2025

Size Report 1

Affected Products

  • firebase-perf

    TypeBase (c85227e)Merge (9e18d2a)Diff
    aar313 kB313 kB+164 B (+0.1%)
    apk (aggressive)1.45 MB1.45 MB+84 B (+0.0%)
    apk (release)10.8 MB10.8 MB+172 B (+0.0%)

Test Logs

  1. https://storage.googleapis.com/firebase-sdk-metric-reports/UbZJNs2055.html

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google-oss-bot commented Aug 19, 2025

Startup Time Report 1

Note: Layout is sometimes suboptimal due to limited formatting support on GitHub. Please check this report on GCS.

Notes

Startup Times

  • fire-perf

    DeviceStatisticsDistributions
    oriole-32
    Percentilec85227e9e18d2aDiffSignificant (?)
    p10291 ±10 μs285 ±8 μs-5.81 μs (-2.0%)NO
    p25302 ±12 μs293 ±6 μs-9.31 μs (-3.1%)NO
    p50318 ±17 μs306 ±7 μs-11.9 μs (-3.8%)NO
    p75354 ±30 μs340 ±24 μs-14.5 μs (-4.1%)NO
    p90415 ±45 μs408 ±52 μs-6.47 μs (-1.6%)NO

    20 test runs in comparison
    CommitTest Runs
    c85227e
    • 2025-08-19_15:10:32.022210_dEPG
    • 2025-08-19_15:10:32.022259_BWPA
    • 2025-08-19_15:10:32.022268_ASSP
    • 2025-08-19_15:10:32.022276_bBAQ
    • 2025-08-19_15:10:32.022283_aQeN
    • 2025-08-19_15:10:32.022290_tOkE
    • 2025-08-19_15:10:32.022298_CrTJ
    • 2025-08-19_15:10:32.022305_EOHw
    • 2025-08-19_15:10:32.022312_zjuh
    • 2025-08-19_15:10:32.022319_iYim
    9e18d2a
    • 2025-08-20_14:55:10.580473_lHuT
    • 2025-08-20_14:55:10.580513_FGSo
    • 2025-08-20_14:55:10.580524_Ovtw
    • 2025-08-20_14:55:10.580532_YwIo
    • 2025-08-20_14:55:10.580540_JRjI
    • 2025-08-20_14:55:10.580547_hcYQ
    • 2025-08-20_14:55:10.580554_LuSv
    • 2025-08-20_14:55:10.580561_kyOc
    • 2025-08-20_14:55:10.580568_nGUD
    • 2025-08-20_14:55:10.580575_YBpC
    redfin-30
    Percentilec85227e9e18d2aDiffSignificant (?)
    p10812 ±45 μs809 ±28 μs-2.36 μs (-0.3%)NO
    p25848 ±51 μs844 ±37 μs-3.44 μs (-0.4%)NO
    p50919 ±65 μs920 ±71 μs+1.07 μs (+0.1%)NO
    p751.03 ±0.06 ms1.06 ±0.08 ms+29.5 μs (+2.9%)NO
    p901.24 ±0.1 ms1.22 ±0.1 ms-17.5 μs (-1.4%)NO

    20 test runs in comparison
    CommitTest Runs
    c85227e
    • 2025-08-19_15:10:32.022210_dEPG
    • 2025-08-19_15:10:32.022259_BWPA
    • 2025-08-19_15:10:32.022268_ASSP
    • 2025-08-19_15:10:32.022276_bBAQ
    • 2025-08-19_15:10:32.022283_aQeN
    • 2025-08-19_15:10:32.022290_tOkE
    • 2025-08-19_15:10:32.022298_CrTJ
    • 2025-08-19_15:10:32.022305_EOHw
    • 2025-08-19_15:10:32.022312_zjuh
    • 2025-08-19_15:10:32.022319_iYim
    9e18d2a
    • 2025-08-20_14:55:10.580473_lHuT
    • 2025-08-20_14:55:10.580513_FGSo
    • 2025-08-20_14:55:10.580524_Ovtw
    • 2025-08-20_14:55:10.580532_YwIo
    • 2025-08-20_14:55:10.580540_JRjI
    • 2025-08-20_14:55:10.580547_hcYQ
    • 2025-08-20_14:55:10.580554_LuSv
    • 2025-08-20_14:55:10.580561_kyOc
    • 2025-08-20_14:55:10.580568_nGUD
    • 2025-08-20_14:55:10.580575_YBpC
  • fire-sessions

    DeviceStatisticsDistributions
    oriole-32
    Percentilec85227e9e18d2aDiffSignificant (?)
    p103.51 ±2 ms3.27 ±1 ms-241 μs (-6.9%)NO
    p253.78 ±2 ms3.52 ±1 ms-260 μs (-6.9%)NO
    p504.24 ±2 ms4.02 ±1 ms-224 μs (-5.3%)NO
    p754.85 ±2 ms4.66 ±1 ms-195 μs (-4.0%)NO
    p905.98 ±2 ms5.79 ±2 ms-194 μs (-3.2%)NO

    20 test runs in comparison
    CommitTest Runs
    c85227e
    • 2025-08-19_15:10:32.022210_dEPG
    • 2025-08-19_15:10:32.022259_BWPA
    • 2025-08-19_15:10:32.022268_ASSP
    • 2025-08-19_15:10:32.022276_bBAQ
    • 2025-08-19_15:10:32.022283_aQeN
    • 2025-08-19_15:10:32.022290_tOkE
    • 2025-08-19_15:10:32.022298_CrTJ
    • 2025-08-19_15:10:32.022305_EOHw
    • 2025-08-19_15:10:32.022312_zjuh
    • 2025-08-19_15:10:32.022319_iYim
    9e18d2a
    • 2025-08-20_14:55:10.580473_lHuT
    • 2025-08-20_14:55:10.580513_FGSo
    • 2025-08-20_14:55:10.580524_Ovtw
    • 2025-08-20_14:55:10.580532_YwIo
    • 2025-08-20_14:55:10.580540_JRjI
    • 2025-08-20_14:55:10.580547_hcYQ
    • 2025-08-20_14:55:10.580554_LuSv
    • 2025-08-20_14:55:10.580561_kyOc
    • 2025-08-20_14:55:10.580568_nGUD
    • 2025-08-20_14:55:10.580575_YBpC
    redfin-30
    Percentilec85227e9e18d2aDiffSignificant (?)
    p107.08 ±2 ms6.82 ±2 ms-262 μs (-3.7%)NO
    p257.68 ±3 ms7.32 ±3 ms-358 μs (-4.7%)NO
    p508.53 ±3 ms8.10 ±4 ms-429 μs (-5.0%)NO
    p759.72 ±4 ms9.01 ±4 ms-719 μs (-7.4%)NO
    p9011.1 ±6 ms10.6 ±5 ms-505 μs (-4.6%)NO

    20 test runs in comparison
    CommitTest Runs
    c85227e
    • 2025-08-19_15:10:32.022210_dEPG
    • 2025-08-19_15:10:32.022259_BWPA
    • 2025-08-19_15:10:32.022268_ASSP
    • 2025-08-19_15:10:32.022276_bBAQ
    • 2025-08-19_15:10:32.022283_aQeN
    • 2025-08-19_15:10:32.022290_tOkE
    • 2025-08-19_15:10:32.022298_CrTJ
    • 2025-08-19_15:10:32.022305_EOHw
    • 2025-08-19_15:10:32.022312_zjuh
    • 2025-08-19_15:10:32.022319_iYim
    9e18d2a
    • 2025-08-20_14:55:10.580473_lHuT
    • 2025-08-20_14:55:10.580513_FGSo
    • 2025-08-20_14:55:10.580524_Ovtw
    • 2025-08-20_14:55:10.580532_YwIo
    • 2025-08-20_14:55:10.580540_JRjI
    • 2025-08-20_14:55:10.580547_hcYQ
    • 2025-08-20_14:55:10.580554_LuSv
    • 2025-08-20_14:55:10.580561_kyOc
    • 2025-08-20_14:55:10.580568_nGUD
    • 2025-08-20_14:55:10.580575_YBpC
  • timeToInitialDisplay

    DeviceStatisticsDistributions
    oriole-32
    Percentilec85227e9e18d2aDiffSignificant (?)
    p10201 ±4 ms204 ±4 ms+3.15 ms (+1.6%)NO
    p25207 ±5 ms210 ±4 ms+3.06 ms (+1.5%)NO
    p50214 ±5 ms217 ±5 ms+2.63 ms (+1.2%)NO
    p75222 ±5 ms226 ±6 ms+3.83 ms (+1.7%)NO
    p90230 ±5 ms237 ±9 ms+7.69 ms (+3.3%)NO

    20 test runs in comparison
    CommitTest Runs
    c85227e
    • 2025-08-19_15:10:32.022210_dEPG
    • 2025-08-19_15:10:32.022259_BWPA
    • 2025-08-19_15:10:32.022268_ASSP
    • 2025-08-19_15:10:32.022276_bBAQ
    • 2025-08-19_15:10:32.022283_aQeN
    • 2025-08-19_15:10:32.022290_tOkE
    • 2025-08-19_15:10:32.022298_CrTJ
    • 2025-08-19_15:10:32.022305_EOHw
    • 2025-08-19_15:10:32.022312_zjuh
    • 2025-08-19_15:10:32.022319_iYim
    9e18d2a
    • 2025-08-20_14:55:10.580473_lHuT
    • 2025-08-20_14:55:10.580513_FGSo
    • 2025-08-20_14:55:10.580524_Ovtw
    • 2025-08-20_14:55:10.580532_YwIo
    • 2025-08-20_14:55:10.580540_JRjI
    • 2025-08-20_14:55:10.580547_hcYQ
    • 2025-08-20_14:55:10.580554_LuSv
    • 2025-08-20_14:55:10.580561_kyOc
    • 2025-08-20_14:55:10.580568_nGUD
    • 2025-08-20_14:55:10.580575_YBpC
    redfin-30
    Percentilec85227e9e18d2aDiffSignificant (?)
    p10235 ±7 ms255 ±4 ms+20.0 ms (+8.5%)NO
    p25241 ±9 ms262 ±3 ms+20.5 ms (+8.5%)NO
    p50249 ±10 ms270 ±3 ms+20.6 ms (+8.3%)NO
    p75258 ±11 ms280 ±5 ms+22.7 ms (+8.8%)NO
    p90269 ±15 ms300 ±14 ms+31.1 ms (+11.6%)NO

    20 test runs in comparison
    CommitTest Runs
    c85227e
    • 2025-08-19_15:10:32.022210_dEPG
    • 2025-08-19_15:10:32.022259_BWPA
    • 2025-08-19_15:10:32.022268_ASSP
    • 2025-08-19_15:10:32.022276_bBAQ
    • 2025-08-19_15:10:32.022283_aQeN
    • 2025-08-19_15:10:32.022290_tOkE
    • 2025-08-19_15:10:32.022298_CrTJ
    • 2025-08-19_15:10:32.022305_EOHw
    • 2025-08-19_15:10:32.022312_zjuh
    • 2025-08-19_15:10:32.022319_iYim
    9e18d2a
    • 2025-08-20_14:55:10.580473_lHuT
    • 2025-08-20_14:55:10.580513_FGSo
    • 2025-08-20_14:55:10.580524_Ovtw
    • 2025-08-20_14:55:10.580532_YwIo
    • 2025-08-20_14:55:10.580540_JRjI
    • 2025-08-20_14:55:10.580547_hcYQ
    • 2025-08-20_14:55:10.580554_LuSv
    • 2025-08-20_14:55:10.580561_kyOc
    • 2025-08-20_14:55:10.580568_nGUD
    • 2025-08-20_14:55:10.580575_YBpC

  1. https://storage.googleapis.com/firebase-sdk-metric-reports/SUjsGigOuK/index.html

@tejasd tejasd marked this pull request as draft August 20, 2025 14:45
@tejasd tejasd self-assigned this Aug 20, 2025
@tejasd tejasd marked this pull request as ready for review August 20, 2025 14:45
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tejasd commented Aug 20, 2025

/gemini review

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Code Review

This pull request updates the logic for detecting background app starts to prevent false positives on newer Android versions (API 34+). The change introduces a 100ms time threshold to differentiate between foreground and background starts, which is a sensible approach. The implementation is clean and the accompanying tests cover the new logic well. I've added a couple of suggestions: one to improve a comment's clarity and another to add a boundary condition test for increased robustness.

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tejasd commented Aug 20, 2025

/gemini summary

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Summary of Changes

This pull request addresses an issue in Firebase Performance Monitoring where app start traces on Android API 34+ devices were incorrectly categorized as background starts, leading to false positives. The changes refine the logic for detecting foreground versus background app starts by introducing a time-based threshold, ensuring more accurate performance data collection for app startup metrics.

Highlights

  • Refined App Start Detection: Implemented a new mechanism in AppStartTrace to differentiate between foreground and background app starts on API 34+ devices, preventing false positives in performance monitoring.
  • Time-based Logic for App Starts: Introduced a 100ms delay threshold to determine if a StartFromBackgroundRunnable execution signifies a true background start, improving the accuracy of app start traces.
  • Code Structure Improvement: Refactored the app start detection logic into a dedicated resolveIsStartedFromBackground() method, enhancing code clarity and maintainability.
  • Enhanced Test Coverage: Added new unit tests to specifically validate the new time-based background start detection logic, including scenarios where the delay is within or beyond the threshold.
Changelog
  • firebase-perf/CHANGELOG.md
  • firebase-perf/src/main/java/com/google/firebase/perf/metrics/AppStartTrace.java
    • Introduced a new constant MAX_BACKGROUND_RUNNABLE_DELAY set to 100 milliseconds.
    • Added a mainThreadRunnableTime field to track the execution time of the StartFromBackgroundRunnable.
    • Implemented a new private method resolveIsStartedFromBackground() to determine if an app start is truly from the background based on the mainThreadRunnableTime and the new delay threshold.
    • Modified the onActivityCreated method to call resolveIsStartedFromBackground() to apply the new logic.
    • Updated the StartFromBackgroundRunnable.run() method to record its execution time using mainThreadRunnableTime instead of directly setting the background flag.
    • Renamed the setIsStartFromBackground() method to setMainThreadRunnableTime() and updated its functionality to set the mainThreadRunnableTime.
  • firebase-perf/src/test/java/com/google/firebase/perf/metrics/AppStartTraceTest.java
    • Added Mockito's spy import for testing purposes.
    • Refactored the testStartFromBackground test into two new tests: testStartFromBackground_within100ms and testStartFromBackground_moreThan100ms.
    • These new tests specifically validate the app's background start detection logic based on whether the mainThreadRunnableTime is within or beyond the 100ms threshold.
    • Ensured fakeExecutorService.runAll() is called in the tests to process pending tasks and verify trace logging.
Activity
  • Automated Javadoc and Gradle deprecation warnings report was posted.
  • An automated coverage report indicated a slight increase (+0.05%) in firebase-perf coverage.
  • An automated size report showed a minor increase in firebase-perf artifact sizes.
  • An automated startup time report confirmed no significant performance regressions.
  • The author, tejasd, requested a Gemini review.
  • The author, tejasd, requested a Gemini summary.
  • gemini-code-assist[bot] suggested renaming the isStartedFromBackground() method to adhere to the Command-Query Separation principle.
  • gemini-code-assist[bot] recommended rephrasing Javadoc for improved clarity regarding the 100ms delay logic.
  • gemini-code-assist[bot] proposed adding a new test case to cover the exact 100ms boundary condition for app start detection.

@tejasd tejasd merged commit e11e900 into main Aug 20, 2025
35 checks passed
@tejasd tejasd deleted the td/app-start branch August 20, 2025 15:20
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3 participants