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Grafana Alloy drops logs at hourly rotation on Windows

Logs written at the start of each hour are missing after hourly file rotation under Grafana Alloy on Windows.

Tier II · Emerging Problems that are still building up.

3 public reports · first reported 18 August 2026 · last reported 25 August 2026

Idea report · $9 · No contacts · All sales final

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What's going wrong

Operators running Grafana Alloy as a Windows service report that log lines written at the start of each hour never reach their destination when files rotate hourly.

AI-assisted: written with the help of AI from the reports. The idea report has the full summary.

In the idea report

  • The full summary.
  • The products the 3 reports are about, and how many came each month.
  • Related problems.

No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.