CuLogMon

Compact Copper monitor that emits a one-line statistical snapshot every second via the normal debug! / info! macros. It is designed to work both on std targets and in bare-metal builds that route logging through defmt.

What it prints

• Copperlist index and windowed rate (Hz)
• End-to-end latency percentiles (p50/p90/p99 + max) in microseconds
• The slowest task in the last window (p99) and the time spent logging the previous report

Usage

[dependencies]
cu-logmon = { version = "*", default-features = true } # disable default-features for no_std

In copperconfig.ron:

monitor: (
    type: "cu_logmon::CuLogMon",
)

For bare-metal targets, disable default features and enable defmt:

cu-logmon = { version = "*", default-features = false, features = ["defmt"] }

Example

Run the built-in demo (std targets):

cargo run -p cu-logmon --example demo

It simulates a 3-task pipeline at ~10 Hz and prints a one-line stat report every second.

Full Copper runtime sample

There is also a minimal source->task->sink Copper app wired to CuLogMon:

cargo run -p cu-logmon --example copper_app

The runtime uses copperconfig.ron in this crate and logs to logs/logmon_copper_app.copper.