Function heartbeat_interval_with_jitter

nodedb/src/data/runtime.rs:416–429

Compute heartbeat interval with ±100ms jitter. Returns a Duration in the range [900ms, 1100ms]. The jitter spreads heartbeat emissions across cores so they don't all fire in the same poll iteration when the system goes idle. Uses a fast splitmix64-style hash of the current timestamp nanos to produce pseudo-random jitter without requiring the `rand` crate in production code (it's dev-only).

()

/// produce pseudo-random jitter without requiring the `rand` crate in
/// production code (it's dev-only).
fn heartbeat_interval_with_jitter() -> std::time::Duration {
    let seed = std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .unwrap_or_default()
        .as_nanos() as u64;
    // splitmix64
    let mut x = seed;
    x ^= x >> 30;
    x = x.wrapping_mul(0xbf58476d1ce4e5b9);
    x ^= x >> 27;
    // Map to [0, 200] → offset by -100 → [-100, +100] ms.
    let jitter_ms = (x % 201) as i64 - 100;
    std::time::Duration::from_millis((1000 + jitter_ms) as u64)
}

/// Extract a human-readable message from a panic payload.
fn panic_message(payload: &Box<dyn std::any::Any + Send>) -> String {