[TIME-TRAVEL] [FEAT] Add metrics for snapshot serialization latency

[dotandev]

Description

We need to monitor how much the snapshotting feature slows down the simulator in production.

Requirements

• Measure duration of take_snapshot and serialize_snapshot in Rust.
• Emit these metrics as a summary at the end of execution.
• Log a warning if snapshotting takes more than 30% of total runtime.

Acceptance Criteria

• Performance stats are visible in --profile or verbose logs.
• Bottlenecks in the serialization loop are identified.

Estimated File Changes: 2 (simulator/src/host.rs, simulator/src/metrics.rs)

[ezedike-evan]

@ezedike-evan has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

gm maintainer

please can i get this work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ezedike-evan to this issue.

[drips-wave]

Congratulations, @ezedike-evan! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @ezedike-evan: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

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