Report process init time for app start

[markushi]

📜 Description

Example event: https://sentry-sdks.sentry.io/performance/sentry-android:5173ff17f6644be5b5fe016352349679
op: process.load, description: "Process Initialization"

💡 Motivation and Context

To better understand the app start, we want to surface the "system" potion of app start as well. It's mainly unactionable, but showcases how long it takes the system to start the app-process, load some resources and finally execute app specific code.

Fixes: #3152

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against 0ff7cc7

[markushi]

@narsaynorath that's how this system span on Android would look like. Please let me know if the op/description would be fine for you.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	466.67 ms	562.38 ms	95.71 ms
Size	1.70 MiB	2.27 MiB	584.74 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
9119d59	389.55 ms	464.40 ms	74.84 ms
937879e	417.64 ms	550.45 ms	132.81 ms
c554ca2	368.52 ms	430.74 ms	62.22 ms
4e260b3	384.08 ms	477.56 ms	93.48 ms
8838e01	387.41 ms	467.00 ms	79.59 ms
eecfab6	399.27 ms	461.82 ms	62.55 ms
3d8bd2b	375.34 ms	446.32 ms	70.98 ms
a3c77bc	375.80 ms	445.85 ms	70.06 ms
c7e2fbc	372.00 ms	461.71 ms	89.71 ms
baaf637	401.69 ms	428.12 ms	26.43 ms

App size

Revision	Plain	With Sentry	Diff
9119d59	1.70 MiB	2.27 MiB	583.84 KiB
937879e	1.72 MiB	2.27 MiB	558.42 KiB
c554ca2	1.70 MiB	2.27 MiB	582.25 KiB
4e260b3	1.72 MiB	2.27 MiB	554.95 KiB
8838e01	1.72 MiB	2.29 MiB	578.15 KiB
eecfab6	1.72 MiB	2.27 MiB	558.56 KiB
3d8bd2b	1.72 MiB	2.29 MiB	577.53 KiB
a3c77bc	1.72 MiB	2.29 MiB	577.53 KiB
c7e2fbc	1.72 MiB	2.29 MiB	576.40 KiB
baaf637	1.72 MiB	2.27 MiB	558.42 KiB

Previous results on branch: feat/process-init-app-start-span

Startup times

Revision	Plain	With Sentry	Diff
d19af0e	418.73 ms	525.19 ms	106.45 ms
eca02f8	380.65 ms	439.69 ms	59.04 ms
754d263	382.94 ms	441.31 ms	58.38 ms
90a9c98	374.26 ms	474.90 ms	100.64 ms
e2a680f	347.08 ms	444.80 ms	97.71 ms

App size

Revision	Plain	With Sentry	Diff
d19af0e	1.70 MiB	2.27 MiB	583.76 KiB
eca02f8	1.70 MiB	2.27 MiB	584.74 KiB
754d263	1.70 MiB	2.27 MiB	583.76 KiB
90a9c98	1.70 MiB	2.27 MiB	583.76 KiB
e2a680f	1.70 MiB	2.27 MiB	584.77 KiB

[narsaynorath]

Perfect, the system span looks good to me!

afaik in the last design conversation we had around the app start UI, we're going to drop the system v. application widget, but this would likely be a span that we would surface in the span op table for users to see the change there