App start: Add spans to first transaction

[buenaflor]

📜 Description

Adds app start spans to the first transaction

Added spans:

• App launch to plugin registration -> measures app launch until the plugin is attached to the flutter engine
• Main isolate setup -> measures time it takes from plugin registration until the earliest point dart is executed (as early as the flutter sdk is initialized)
• First frame render -> measures time between main isolate dart code executing until the first frame

💡 Motivation and Context

mobile starfish

In combination with sentry navigator observer you'll be able to see app start traces in the app start module

💚 How did you test it?

Unit Tests

📝 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

🔮 Next steps

[github-actions]

Android Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	499.43 ms	593.87 ms	94.44 ms
Size	6.33 MiB	7.30 MiB	987.83 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
d53c6fa	282.83 ms	344.00 ms	61.17 ms
ef31c7f	311.39 ms	359.33 ms	47.94 ms
eecbbca	324.37 ms	352.49 ms	28.12 ms
48adddf	353.96 ms	431.10 ms	77.14 ms
b0811cc	580.00 ms	675.69 ms	95.69 ms
89ea268	320.35 ms	377.68 ms	57.33 ms
ccc09e4	308.21 ms	357.74 ms	49.54 ms
d089990	361.67 ms	442.50 ms	80.83 ms
2331d89	352.45 ms	417.34 ms	64.89 ms
1a93825	347.31 ms	424.54 ms	77.23 ms

App size

Revision	Plain	With Sentry	Diff
d53c6fa	6.16 MiB	7.14 MiB	1011.18 KiB
ef31c7f	6.06 MiB	7.09 MiB	1.03 MiB
eecbbca	5.94 MiB	6.89 MiB	975.78 KiB
48adddf	6.27 MiB	7.20 MiB	959.09 KiB
b0811cc	6.33 MiB	7.27 MiB	954.02 KiB
89ea268	6.06 MiB	7.03 MiB	989.24 KiB
ccc09e4	5.94 MiB	6.95 MiB	1.01 MiB
d089990	6.34 MiB	7.28 MiB	967.79 KiB
2331d89	5.94 MiB	6.96 MiB	1.02 MiB
1a93825	6.27 MiB	7.20 MiB	956.36 KiB

Previous results on branch: feat/app-start-improve

Startup times

Revision	Plain	With Sentry	Diff
05c208c	401.73 ms	467.73 ms	66.00 ms
2bb3887	361.78 ms	416.31 ms	54.53 ms
6413e81	357.24 ms	370.44 ms	13.20 ms
62cb2be	357.40 ms	415.83 ms	58.42 ms
5ad308b	368.71 ms	434.94 ms	66.22 ms

App size

Revision	Plain	With Sentry	Diff
05c208c	6.33 MiB	7.30 MiB	987.85 KiB
2bb3887	6.33 MiB	7.30 MiB	987.83 KiB
6413e81	6.33 MiB	7.30 MiB	987.83 KiB
62cb2be	6.33 MiB	7.30 MiB	987.82 KiB
5ad308b	6.34 MiB	7.28 MiB	966.36 KiB

[github-actions]

iOS Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1247.69 ms	1257.26 ms	9.57 ms
Size	8.32 MiB	9.37 MiB	1.05 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
689d2fd	1257.71 ms	1265.16 ms	7.45 ms
bd37365	1236.22 ms	1243.27 ms	7.04 ms
8fa3934	1252.79 ms	1272.41 ms	19.62 ms
aed5947	1268.67 ms	1281.10 ms	12.43 ms
9d7e862	1236.88 ms	1258.62 ms	21.74 ms
1d47eb7	1212.57 ms	1222.00 ms	9.43 ms
eb1a7c1	1281.25 ms	1295.40 ms	14.15 ms
78eeed5	1259.33 ms	1270.14 ms	10.82 ms
e964e2b	1203.50 ms	1223.16 ms	19.66 ms
bdd1a23	1225.78 ms	1235.82 ms	10.04 ms

App size

Revision	Plain	With Sentry	Diff
689d2fd	8.10 MiB	9.16 MiB	1.06 MiB
bd37365	8.28 MiB	9.34 MiB	1.06 MiB
8fa3934	8.09 MiB	9.07 MiB	1000.86 KiB
aed5947	8.16 MiB	9.17 MiB	1.01 MiB
9d7e862	8.32 MiB	9.38 MiB	1.05 MiB
1d47eb7	8.29 MiB	9.39 MiB	1.09 MiB
eb1a7c1	8.15 MiB	9.13 MiB	1000.10 KiB
78eeed5	8.29 MiB	9.38 MiB	1.09 MiB
e964e2b	8.32 MiB	9.38 MiB	1.06 MiB
bdd1a23	8.29 MiB	9.39 MiB	1.10 MiB

Previous results on branch: feat/app-start-improve

Startup times

Revision	Plain	With Sentry	Diff
2bb3887	1231.44 ms	1239.15 ms	7.71 ms
5ad308b	1244.71 ms	1267.75 ms	23.04 ms
05c208c	1247.43 ms	1264.23 ms	16.80 ms
62cb2be	1243.78 ms	1266.17 ms	22.39 ms

App size

Revision	Plain	With Sentry	Diff
2bb3887	8.32 MiB	9.43 MiB	1.10 MiB
5ad308b	8.32 MiB	9.40 MiB	1.08 MiB
05c208c	8.32 MiB	9.40 MiB	1.08 MiB
62cb2be	8.32 MiB	9.37 MiB	1.05 MiB

[stefanosiano]

nice!