Add FAQ entry for "too many open files" error in chaos experiments

[Copilot]

Addresses chaos-mesh/chaos-mesh#4429

Users running multiple chaos experiments or IOChaos workloads hit file descriptor limits in chaos-daemon, causing "too many open files" errors.

Changes

Added FAQ entry covering:

• Root causes: concurrent experiments, IOChaos file descriptor usage, low ulimit defaults
• Solutions:
  • Helm configuration for pod-level limits via chaosDaemon.podSecurityContext.sysctls
  • System-level ulimit adjustments (temporary and permanent)
  • Operational mitigations (experiment throttling, scope reduction)
  • Debugging via chaos-daemon logs

Updated across all documentation versions (current, 2.8.0, 2.7.3, 2.6.7) and locales (en, zh).

Example Helm configuration:

chaosDaemon:
  podSecurityContext:
    sysctls:
      - name: fs.file-max
        value: '65536'

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/chaos-mesh/chaos-mesh/issues/4429
  • Triggering command: /usr/bin/curl curl -s REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Q&A about "too many open files"</issue_title>
<issue_description>chaos-mesh/chaos-mesh#4429</issue_description>

<agent_instructions>pls update the Q&A section</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Q&A about "too many open files" #442

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