Diagnostics / Custom Diagnostic

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//! This example illustrates how to create a custom diagnostic.

use bevy::{
        Diagnostic, DiagnosticPath, Diagnostics, LogDiagnosticsPlugin, RegisterDiagnostic,

fn main() {
            // The "print diagnostics" plugin is optional.
            // It just visualizes our diagnostics in the console.
        // Diagnostics must be initialized before measurements can be added.
        .register_diagnostic(Diagnostic::new(SYSTEM_ITERATION_COUNT).with_suffix(" iterations"))
        .add_systems(Update, my_system)

// All diagnostics should have a unique DiagnosticPath.
const SYSTEM_ITERATION_COUNT: DiagnosticPath = DiagnosticPath::const_new("system_iteration_count");

fn my_system(mut diagnostics: Diagnostics) {
    // Add a measurement of 10.0 for our diagnostic each time this system runs.
    diagnostics.add_measurement(&SYSTEM_ITERATION_COUNT, || 10.0);