"Container CPU usage" shows "NaN%" in Containers dashboard

[DmitriVyaznikov]

Description

Description

The aggregate "Container CPU usage" metric at the top of the Containers page displays NaN% / 1200% instead of the actual total CPU percentage. The per-container CPU values in the table and docker stats CLI output are correct — only the aggregate summary in the UI is broken.

Environment

• Docker Desktop: 4.62.0 (219486)
• Docker Engine: 29.2.1
• OS: macOS 26.2 (Build 25C56), Apple Silicon (arm64)
• Hardware: Apple M3 Max, 128 GB RAM
• Docker resource limit: 12 CPUs, 15.23 GB RAM

Reproduce

1. Run multiple Docker Compose projects (6 projects, 18 containers total in my case)
2. Open Docker Desktop → Containers tab
3. Observe the "Container CPU usage" summary at the top of the page

Actual Behavior

Displays NaN% / 1200% (see screenshot). The "1200%" max value (12 CPUs x 100%) is computed correctly, but the current usage is NaN.

Expected behavior

The aggregate CPU usage should display a numeric percentage, e.g. 14.5% / 1200%.

docker version

Client:
 Version:           29.2.1
 API version:       1.53
 Go version:        go1.25.6
 Git commit:        a5c7197
 Built:             Mon Feb  2 17:16:37 2026
 OS/Arch:           darwin/arm64
 Context:           desktop-linux

Server: Docker Desktop 4.62.0 (219486)
 Engine:
  Version:          29.2.1
  API version:      1.53 (minimum version 1.44)
  Go version:       go1.25.6
  Git commit:       6bc6209
  Built:            Mon Feb  2 17:16:47 2026
  OS/Arch:          linux/arm64
  Experimental:     false
 containerd:
  Version:          v2.2.1
  GitCommit:        dea7da592f5d1d2b7755e3a161be07f43fad8f75
 runc:
  Version:          1.3.4
  GitCommit:        v1.3.4-0-gd6d73eb8
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

docker info

Client:
 Version:    29.2.1
 Context:    desktop-linux
 Debug Mode: false
 Plugins:
  ai: Docker AI Agent - Ask Gordon (Docker Inc.)
    Version:  v1.18.0
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-ai
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.31.1-desktop.1
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v5.0.2
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-compose
  debug: Get a shell into any image or container (Docker Inc.)
    Version:  0.0.47
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-debug
  desktop: Docker Desktop commands (Docker Inc.)
    Version:  v0.3.0
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-desktop
  extension: Manages Docker extensions (Docker Inc.)
    Version:  v0.2.31
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-extension
  init: Creates Docker-related starter files for your project (Docker Inc.)
    Version:  v1.4.0
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-init
  mcp: Docker MCP Plugin (Docker Inc.)
    Version:  v0.40.0
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-mcp
  model: Docker Model Runner (Docker Inc.)
    Version:  v1.0.12
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-model
  offload: Docker Offload (Docker Inc.)
    Version:  v0.5.52
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-offload
  pass: Docker Pass Secrets Manager Plugin (beta) (Docker Inc.)
    Version:  v0.0.24
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-pass
  sandbox: Docker Sandbox (Docker Inc.)
    Version:  v0.12.0
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-sandbox
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.)
    Version:  0.6.0
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-sbom
  scout: Docker Scout (Docker Inc.)
    Version:  v1.20.0
    Path:     /Users/dmitriy/.docker/cli-plugins/docker-scout

Server:
 Containers: 19
  Running: 18
  Paused: 0
  Stopped: 1
 Images: 26
 Server Version: 29.2.1
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 CDI spec directories:
  /etc/cdi
  /var/run/cdi
 Discovered Devices:
  cdi: docker.com/gpu=webgpu
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: dea7da592f5d1d2b7755e3a161be07f43fad8f75
 runc version: v1.3.4-0-gd6d73eb8
 init version: de40ad0
 Security Options:
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.12.69-linuxkit
 Operating System: Docker Desktop
 OSType: linux
 Architecture: aarch64
 CPUs: 12
 Total Memory: 15.6GiB
 Name: docker-desktop
 ID: fb61f805-9e5b-4918-b2a7-e9de465384f6
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 HTTP Proxy: http.docker.internal:3128
 HTTPS Proxy: http.docker.internal:3128
 No Proxy: hubproxy.docker.internal
 Labels:
  com.docker.desktop.address=unix:///Users/dmitriy/Library/Containers/com.docker.docker/Data/docker-cli.sock
 Experimental: false
 Insecure Registries:
  hubproxy.docker.internal:5555
  ::1/128
  127.0.0.0/8
 Live Restore Enabled: false
 Firewall Backend: iptables

Diagnostics ID

6DAF90C9-830E-4025-B05B-D8D79B7C9B82/20260227162858

Additional Info

• docker stats --no-stream returns valid CPU percentages for all 18 containers (sum ~13-14%)
• Memory usage summary works correctly: 4.54GB / 15.23GB
• Individual container CPU values in the table are also correct (0.11%–2.13%)
• The issue persists across page refreshes and Docker Desktop restarts
• Likely a JS NaN propagation from summing/parsing container CPU values in the dashboard aggregation logic