Diagnostics / Custom Diagnostic

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This example is running in WebGL2 and should work in most browsers. You can check the WebGPU examples here.

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

use bevy::{
    diagnostic::{Diagnostic, DiagnosticId, 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.
            Diagnostic::new(SYSTEM_ITERATION_COUNT, "system_iteration_count", 10)
                .with_suffix(" iterations"),
        .add_systems(Update, my_system)

// All diagnostics should have a unique DiagnosticId.
// For each new diagnostic, generate a new random number.
pub const SYSTEM_ITERATION_COUNT: DiagnosticId =

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);