Port: Linux container CPU quota awareness (upstream #585)

[Starosdev]

Summary

Port improvement from upstream AnalogJ/scrutiny PR AnalogJ#585 to make Go respect Linux container CPU quotas.

Problem

Go is not cgroup-aware by default. It sets GOMAXPROCS to the number of available CPU threads on the host, regardless of container CPU limits. This causes:

• High CPU throttling
• Degraded application performance in containers with CPU limits

Solution

Use go.uber.org/automaxprocs to automatically set GOMAXPROCS based on the container's CPU quota.

Changes Required

File: go.mod

require (
    // ... existing requires
    go.uber.org/automaxprocs v1.5.3
)

File: collector/cmd/collector-metrics/collector-metrics.go

import (
    // ... existing imports
    _ "go.uber.org/automaxprocs"
)

File: collector/cmd/collector-selftest/collector-selftest.go

import (
    // ... existing imports
    _ "go.uber.org/automaxprocs"
)

File: webapp/backend/cmd/scrutiny/scrutiny.go

import (
    // ... existing imports
    _ "go.uber.org/automaxprocs"
)

File: webapp/backend/pkg/models/testdata/helper.go

import (
    // ... existing imports
    _ "go.uber.org/automaxprocs"
)

Upstream Reference

• PR: chore: use Linux container CPU quota AnalogJ/scrutiny#585
• Issue: [BUG] Scrutiny should be cgroup aware AnalogJ/scrutiny#584
• Complexity: Small (add dependency + 4 imports)
• Priority: Medium

Acceptance Criteria

• Add automaxprocs dependency
• Add blank import to all main entry points
• Test in container with CPU limits
• Verify GOMAXPROCS is set correctly

[Starosdev]

Related Issues

• Part of upstream port effort
• Related to Port: Improve Docker process handling with exec (upstream #427) #111 (both are Docker/container improvements)
• Related to Port: Add wait between disk checks (upstream #710) #108 (both improve collector behavior)

Upstream Reference

AnalogJ#585

[Starosdev]

Implemented in PR #133 (merged 2026-01-24).

Added go.uber.org/automaxprocs for automatic GOMAXPROCS configuration based on container CPU quota.