rsyslog Windows Agent 26.09 Technical Release Notes
Release date: September 1, 2026
Service build: 26.9.0.353
Configuration Client build: 26.9.0.442
User Interface build: 26.9.0.1017
Upgrade assessment
Recommendation: Recommended update
Why update now: This release corrects service-stop handling during configuration reload, startup of custom-named Windows services, and a timestamp-conversion crash. It also improves administration through the User Interface metrics dashboard.
If you defer: Installations retain the service-operation and timestamp-conversion limitations addressed by this release, as well as the earlier User Interface administration behaviour.
Who benefits most: Administrators who reload configuration, use custom Windows service names, or use the User Interface metrics dashboard.
Upgrade and verification: Update using the normal supported path. Confirm service build 26.9.0.353, reload configuration in a controlled maintenance window, verify a custom service name where used, and reload the User Interface dashboard after Metrics Helper setup.
Important changes
Service operation and reliability
- Change: Stop requests are retained during configuration reload, and services with custom Windows service names start reliably.
- Operational impact: Reduces avoidable disruption during service administration and maintenance.
- Applies to: rsyslog Windows Agent installations that reload configuration or use custom service names.
- Verification: Reload configuration and, where applicable, stop/start the custom-named service during a controlled maintenance window.
Timestamp conversion reliability
- Change: A crash while converting certain read-only timestamp properties is corrected.
- Operational impact: Improves reliability for configurations that process these timestamp properties.
- Applies to: rsyslog Windows Agent configurations using the affected timestamp conversion path.
- Verification: Process a representative test message that uses the relevant timestamp property.
Configuration Client and User Interface
- After local Metrics Helper setup, standard users can reload the User Interface metrics dashboard.
- Service-owned older General settings no longer produce unnecessary unknown-configuration indications.