Report pre-warmed app starts

[philipphofmann]

:scroll: Description

Report pre-warmed app starts by dropping the first app start spans if pre-warming paused during these steps. This approach will shorten the app start duration, but it represents the duration a user has to wait after clicking the app icon until the app is responsive. We report the app start type in the appContext, so Sentry can make changes to the UI for prewarmed app starts.

Normal app start with all spans

Pre-warmed with dropped spans

App Context

:bulb: Motivation and Context

Fixes GH-1897

:green_heart: How did you test it?

Unit tests and simulators

:pencil: Checklist

• [x] I reviewed the submitted code
• [x] I added tests to verify the changes
• [ ] I updated the docs if needed
• [x] Review from the native team if needed
• [x] No breaking changes

:crystal_ball: Next steps

[philipphofmann]

Please don't merge yet, waiting for a green light that pre-warmed app starts are searchable in discover.

[philipphofmann]

Blocked by https://github.com/getsentry/sentry/issues/36927

[github-actions[bot]]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[github-actions[bot]]

Performance metrics :rocket:

	Plain	With Sentry	Diff
Startup time (ms)	1215.39	1237.80	22.41
Size (bytes)	21157	331395	310238

[github-actions[bot]]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[github-actions[bot]]

Performance metrics :rocket:

	Plain	With Sentry	Diff
Startup time	1208.16 ms	1220.71 ms	12.55 ms
Size	20.75 KiB	369.28 KiB	348.52 KiB

Baseline results on branch: master

Startup times

Revision	Plain	With Sentry	Diff
347a8e9283b68c324cdd87978f84033339ccfc4e	1243.50 ms	1265.90 ms	22.40 ms
8b040e4b6faf9a16fa9264e43280c412016bb705	1234.76 ms	1244.71 ms	9.95 ms
bdfccaaf7ec472bda6f92604edde3a1858c5e41f	1202.83 ms	1228.96 ms	26.13 ms
075911d74eb91917fb88910bf871cd65d834f7fd	1256.73 ms	1271.22 ms	14.49 ms
5025d2e2643a41b83ce05711508ca9f77caa8eb8	1248.52 ms	1251.72 ms	3.20 ms
4a0c2822a7cd9f2ff56a4200af04533585b0a2cc	1228.60 ms	1250.74 ms	22.14 ms
d73ebd013ca8f9e0edc952b36adb6f8a46b5541e	1200.83 ms	1236.10 ms	35.27 ms
c2a9b600dd98bb34fc25bdb421a05a1fc853c6a9	1222.10 ms	1240.62 ms	18.52 ms
5025d2e2643a41b83ce05711508ca9f77caa8eb8	1245.14 ms	1268.58 ms	23.44 ms
6177f2ddf6adfc0d15e7343689c48b80eb88476d	1206.55 ms	1226.20 ms	19.65 ms

App size

Revision	Plain	With Sentry	Diff
347a8e9283b68c324cdd87978f84033339ccfc4e	20.51 KiB	333.16 KiB	312.65 KiB
8b040e4b6faf9a16fa9264e43280c412016bb705	20.50 KiB	333.54 KiB	313.04 KiB
bdfccaaf7ec472bda6f92604edde3a1858c5e41f	20.50 KiB	361.80 KiB	341.29 KiB
075911d74eb91917fb88910bf871cd65d834f7fd	20.51 KiB	332.90 KiB	312.39 KiB
5025d2e2643a41b83ce05711508ca9f77caa8eb8	20.51 KiB	331.79 KiB	311.28 KiB
4a0c2822a7cd9f2ff56a4200af04533585b0a2cc	20.51 KiB	333.10 KiB	312.60 KiB
d73ebd013ca8f9e0edc952b36adb6f8a46b5541e	20.50 KiB	365.18 KiB	344.68 KiB
c2a9b600dd98bb34fc25bdb421a05a1fc853c6a9	20.50 KiB	333.54 KiB	313.04 KiB
5025d2e2643a41b83ce05711508ca9f77caa8eb8	20.51 KiB	331.79 KiB	311.28 KiB
6177f2ddf6adfc0d15e7343689c48b80eb88476d	20.51 KiB	332.90 KiB	312.40 KiB

Previous results on branch: fix/report-prewarmed-app-starts

Startup times

Revision	Plain	With Sentry	Diff
6cf9be67aef2849b1b02261fb45939a0bfd2a043	1216.21 ms	1247.00 ms	30.79 ms
f8f4884496fff2f8ffc39c9d3d7b8be24bedae1a	1189.00 ms	1233.60 ms	44.60 ms
8136d66d39dedd7e41592c99fc9f756d3311288c	1239.44 ms	1266.82 ms	27.38 ms
55ab513ff0122772c16def9f345fa01c47625cf6	1219.20 ms	1254.55 ms	35.35 ms
58f341581c8fb26cf527ba4335642d7b5078ac76	1235.48 ms	1265.36 ms	29.88 ms
746f90b7cad524f6a4d5fa2ae439cc3c0303e3ae	1235.90 ms	1250.02 ms	14.12 ms
54bfce412960e79bb79865dfec5eae4bba18da47	1245.84 ms	1271.64 ms	25.80 ms

App size

Revision	Plain	With Sentry	Diff
6cf9be67aef2849b1b02261fb45939a0bfd2a043	20.75 KiB	369.27 KiB	348.52 KiB
f8f4884496fff2f8ffc39c9d3d7b8be24bedae1a	20.75 KiB	369.18 KiB	348.42 KiB
8136d66d39dedd7e41592c99fc9f756d3311288c	20.75 KiB	369.18 KiB	348.43 KiB
55ab513ff0122772c16def9f345fa01c47625cf6	20.75 KiB	369.28 KiB	348.52 KiB
58f341581c8fb26cf527ba4335642d7b5078ac76	20.75 KiB	369.27 KiB	348.52 KiB
746f90b7cad524f6a4d5fa2ae439cc3c0303e3ae	20.75 KiB	369.18 KiB	348.42 KiB
54bfce412960e79bb79865dfec5eae4bba18da47	20.75 KiB	368.59 KiB	347.84 KiB