Start missing TTFD for root screen transaction

[denrase]

📜 Description

• Start TTFD in app start integration through timeToDisplayTracker

Refactoring:

• Move timeToDisplayTracker instance to SentryFlutterOptions
• Don't start any transaction if users opt out of auto app start and don't provide app start end manually.

💡 Motivation and Context

• TTFD start in app route was accidentally removed with Improve app start integration #2266

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

[codecov]

Codecov Report

Attention: Patch coverage is 91.22807% with 5 lines in your changes missing coverage. Please review.

Project coverage is 85.15%. Comparing base (e239c83) to head (ab11fff).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
flutter/lib/src/sentry_flutter.dart	0.00%	4 Missing ⚠️
...er/lib/src/navigation/time_to_display_tracker.dart	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2332      +/-   ##
==========================================
+ Coverage   84.77%   85.15%   +0.38%     
==========================================
  Files         253       79     -174     
  Lines        9060     2783    -6277     
==========================================
- Hits         7681     2370    -5311     
+ Misses       1379      413     -966     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

Android Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	448.18 ms	500.25 ms	52.07 ms
Size	6.49 MiB	7.57 MiB	1.08 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
0aaa46e	313.39 ms	373.23 ms	59.85 ms
4656f10	626.98 ms	693.36 ms	66.38 ms
2d74010	400.42 ms	466.50 ms	66.08 ms
f7f46dc	306.38 ms	363.32 ms	56.95 ms
3751dbc	486.20 ms	538.68 ms	52.48 ms
bffc2c5	348.00 ms	399.89 ms	51.89 ms
0bed04d	382.15 ms	458.33 ms	76.18 ms
cc80714	333.26 ms	388.80 ms	55.54 ms
870f5eb	329.45 ms	369.29 ms	39.84 ms
2f8f173	323.31 ms	373.29 ms	49.97 ms

App size

Revision	Plain	With Sentry	Diff
0aaa46e	6.16 MiB	7.14 MiB	1007.32 KiB
4656f10	6.33 MiB	7.30 MiB	988.47 KiB
2d74010	6.33 MiB	7.26 MiB	943.41 KiB
f7f46dc	6.06 MiB	7.03 MiB	993.54 KiB
3751dbc	6.49 MiB	7.55 MiB	1.06 MiB
bffc2c5	6.34 MiB	7.28 MiB	966.31 KiB
0bed04d	6.33 MiB	7.30 MiB	987.71 KiB
cc80714	6.34 MiB	7.28 MiB	966.31 KiB
870f5eb	5.94 MiB	6.92 MiB	1005.77 KiB
2f8f173	5.94 MiB	6.95 MiB	1.01 MiB

Previous results on branch: fix/app_start_root_route_ttfd

Startup times

Revision	Plain	With Sentry	Diff
7d08c83	457.77 ms	488.96 ms	31.19 ms
169b813	445.98 ms	491.26 ms	45.28 ms

App size

Revision	Plain	With Sentry	Diff
7d08c83	6.49 MiB	7.56 MiB	1.07 MiB
169b813	6.49 MiB	7.55 MiB	1.06 MiB

[github-actions]

iOS Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1242.14 ms	1260.19 ms	18.05 ms
Size	8.38 MiB	9.75 MiB	1.37 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
5f2f77b	1231.76 ms	1248.43 ms	16.67 ms
a510d1d	1277.04 ms	1291.57 ms	14.53 ms
3751dbc	1261.45 ms	1287.79 ms	26.34 ms
8a111a9	1251.49 ms	1270.77 ms	19.28 ms
f25f207	1233.44 ms	1260.73 ms	27.30 ms
04bd9e6	1230.78 ms	1250.71 ms	19.94 ms
633cf2e	1257.96 ms	1275.73 ms	17.77 ms
d783424	1265.71 ms	1277.00 ms	11.29 ms
e3ef570	1220.08 ms	1239.66 ms	19.58 ms
f9d18f3	1240.20 ms	1242.78 ms	2.57 ms

App size

Revision	Plain	With Sentry	Diff
5f2f77b	8.33 MiB	9.64 MiB	1.31 MiB
a510d1d	8.16 MiB	9.17 MiB	1.01 MiB
3751dbc	8.38 MiB	9.73 MiB	1.35 MiB
8a111a9	8.38 MiB	9.74 MiB	1.36 MiB
f25f207	8.32 MiB	9.38 MiB	1.05 MiB
04bd9e6	8.33 MiB	9.61 MiB	1.27 MiB
633cf2e	8.15 MiB	9.12 MiB	986.26 KiB
d783424	8.29 MiB	9.38 MiB	1.09 MiB
e3ef570	8.32 MiB	9.38 MiB	1.06 MiB
f9d18f3	8.29 MiB	9.36 MiB	1.07 MiB

Previous results on branch: fix/app_start_root_route_ttfd

Startup times

Revision	Plain	With Sentry	Diff
7d08c83	1243.85 ms	1259.06 ms	15.21 ms
169b813	1252.22 ms	1269.76 ms	17.54 ms

App size

Revision	Plain	With Sentry	Diff
7d08c83	8.38 MiB	9.74 MiB	1.36 MiB
169b813	8.38 MiB	9.73 MiB	1.35 MiB

[denrase]

@buenaflor Also checked the example app, looks like everything is working as expected as far as i can tell.

[buenaflor]

is the root ttfd example one where it timed out?

[buenaflor]

can you also confirm that the measurements are correctly set with time_to_initial_display and time_to_full_display

[buenaflor]

only make sure measurements are correct but otherwise lgtm 👍

[github-actions]

🚨 Detected changes in high risk code 🚨

High-risk code has higher potential to break the SDK and may be hard to test. To prevent severe bugs, apply the rollout process for releasing such changes and be extra careful when changing and reviewing these files:

• flutter/lib/src/integrations/native_app_start_integration.dart

[denrase]

@buenaflor What do you mean by "correct"? The duration or order?