From 27fe2e88bd77a356c8be5db050a9021495c9039f Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume1.gomez@gmail.com>
Date: Sun, 13 Jul 2025 00:40:36 +0200
Subject: [PATCH 1/2] Update `sysinfo` version to `0.36.0` (#20084)

Some bugfixes and new API additions.
---
 crates/bevy_diagnostic/Cargo.toml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/crates/bevy_diagnostic/Cargo.toml b/crates/bevy_diagnostic/Cargo.toml
index 424ca67437..a1803151fc 100644
--- a/crates/bevy_diagnostic/Cargo.toml
+++ b/crates/bevy_diagnostic/Cargo.toml
@@ -71,14 +71,14 @@ log = { version = "0.4", default-features = false }
 # macOS
 [target.'cfg(all(target_os="macos"))'.dependencies]
 # Some features of sysinfo are not supported by apple. This will disable those features on apple devices
-sysinfo = { version = "0.35.0", optional = true, default-features = false, features = [
+sysinfo = { version = "0.36.0", optional = true, default-features = false, features = [
   "apple-app-store",
   "system",
 ] }
 
 # Only include when on linux/windows/android/freebsd
 [target.'cfg(any(target_os = "linux", target_os = "windows", target_os = "android", target_os = "freebsd"))'.dependencies]
-sysinfo = { version = "0.35.0", optional = true, default-features = false, features = [
+sysinfo = { version = "0.36.0", optional = true, default-features = false, features = [
   "system",
 ] }
 

From 1525dff7ada14714b35c8908381d534a7833faa3 Mon Sep 17 00:00:00 2001
From: onbjerg <onbjerg@users.noreply.github.com>
Date: Sun, 13 Jul 2025 01:00:38 +0200
Subject: [PATCH 2/2] Add `max_history_length` to
 `EntityCountDiagnosticsPlugin` (#20085)

# Objective

I was building out a diagnostics panel in egui when I noticed that I
could specify the max history length for the
`FrameTimeDiagnosticsPlugin`, but not for the
`EntityCountDiagnosticsPlugin`. The objective was to harmonize the two,
making the diagnostic history length configurable for both.

## Solution

I added a `EntityCountDiagnosticsPlugin::new`, and a `Default` impl that
matches `FrameTimeDiagnosticsPlugin`.

This is a breaking change, given the plugin had no fields previously.

## Testing

I did not test this.
---
 .../src/entity_count_diagnostics_plugin.rs    | 29 +++++++++++++++----
 examples/diagnostics/log_diagnostics.rs       |  2 +-
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/crates/bevy_diagnostic/src/entity_count_diagnostics_plugin.rs b/crates/bevy_diagnostic/src/entity_count_diagnostics_plugin.rs
index b20a82bf6c..1de4f4c029 100644
--- a/crates/bevy_diagnostic/src/entity_count_diagnostics_plugin.rs
+++ b/crates/bevy_diagnostic/src/entity_count_diagnostics_plugin.rs
@@ -1,20 +1,39 @@
 use bevy_app::prelude::*;
 use bevy_ecs::entity::Entities;
 
-use crate::{Diagnostic, DiagnosticPath, Diagnostics, RegisterDiagnostic};
+use crate::{
+    Diagnostic, DiagnosticPath, Diagnostics, RegisterDiagnostic, DEFAULT_MAX_HISTORY_LENGTH,
+};
 
 /// Adds "entity count" diagnostic to an App.
 ///
 /// # See also
 ///
 /// [`LogDiagnosticsPlugin`](crate::LogDiagnosticsPlugin) to output diagnostics to the console.
-#[derive(Default)]
-pub struct EntityCountDiagnosticsPlugin;
+pub struct EntityCountDiagnosticsPlugin {
+    /// The total number of values to keep.
+    pub max_history_length: usize,
+}
+
+impl Default for EntityCountDiagnosticsPlugin {
+    fn default() -> Self {
+        Self::new(DEFAULT_MAX_HISTORY_LENGTH)
+    }
+}
+
+impl EntityCountDiagnosticsPlugin {
+    /// Creates a new `EntityCountDiagnosticsPlugin` with the specified `max_history_length`.
+    pub fn new(max_history_length: usize) -> Self {
+        Self { max_history_length }
+    }
+}
 
 impl Plugin for EntityCountDiagnosticsPlugin {
     fn build(&self, app: &mut App) {
-        app.register_diagnostic(Diagnostic::new(Self::ENTITY_COUNT))
-            .add_systems(Update, Self::diagnostic_system);
+        app.register_diagnostic(
+            Diagnostic::new(Self::ENTITY_COUNT).with_max_history_length(self.max_history_length),
+        )
+        .add_systems(Update, Self::diagnostic_system);
     }
 }
 
diff --git a/examples/diagnostics/log_diagnostics.rs b/examples/diagnostics/log_diagnostics.rs
index 0e00e69ccd..1a36f9a1f2 100644
--- a/examples/diagnostics/log_diagnostics.rs
+++ b/examples/diagnostics/log_diagnostics.rs
@@ -33,7 +33,7 @@ fn main() {
             // Adds frame time, FPS and frame count diagnostics.
             FrameTimeDiagnosticsPlugin::default(),
             // Adds an entity count diagnostic.
-            EntityCountDiagnosticsPlugin,
+            EntityCountDiagnosticsPlugin::default(),
             // Adds cpu and memory usage diagnostics for systems and the entire game process.
             SystemInformationDiagnosticsPlugin,
             // Forwards various diagnostics from the render app to the main app.