bug: very high CPU usage from events server (Rust 1.78.0 regression)

[insertish]

What happened?

Something changed between 20240805-1 and 20240829-3 that is causing very high CPU usage.

[insertish]

nominal:

problematic:

[insertish]

Configurations tested:

Image	Rust Version	Base Image
20240805-1	1.70.0	debian:bullseye-slim	✅
20240829-3, 20240830-1	1.80.1	gcr.io/distroless/cc-debian12:nonroot	❌
20240909-1-debug	1.80.1	debian:bookworm-slim	❌
20240909-4-debug	1.70.0	gcr.io/distroless/cc-debian12:nonroot	No build
20240909-5-debug	1.76.0	gcr.io/distroless/cc-debian12:nonroot	✅
20240909-6-debug †	1.79.0	gcr.io/distroless/cc-debian12:nonroot	❌
20240909-7-debug	1.77.0	gcr.io/distroless/cc-debian12:nonroot	✅
20240909-8-debug	1.78.0	gcr.io/distroless/cc-debian12:nonroot	❌
20240909-9-debug	1.77.2	gcr.io/distroless/cc-debian12:nonroot	✅

† Image overwritten by 7-debug by accident

[insertish]

All signs point to a regression in Rust currently.

[insertish]

Something changed in Rust 1.78.0 that is causing very high CPU usage: https://releases.rs/docs/1.78.0/