Refactor error handling and message printing

[kazeburo]

PR Type

Bug fix

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Description

• Suppress stale metric output after collection errors

• Print CPU, FDs, and memory results only on success

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Diagram Walkthrough

flowchart LR
  Collect["Collect metric statistics"]
  Error["Report collection error"]
  Output["Print metric output"]
  Collect -- "fails" --> Error
  Collect -- "succeeds with message" --> Output

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File Walkthrough

	Relevant files
Bug fix	main.go Guard metric output after collection errors                            main.go Print CPU statistics only when cpuStat succeeds. Print file-descriptor statistics only when fdsStat succeeds. Print memory statistics only when memStat succeeds. +3/-6

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

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🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

[github-actions]

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