Duplicate log entries appear when using multiple providers with Microsoft.Extensions.Logging

Goal: Ensure that each log message is emitted only once across all configured logging providers in a .NET application.

Constraints: The built‑in LoggerFilterOptions applies filtering per provider, but providers such as Console and Debug each receive the filtered log stream independently, so the same message can be logged multiple times.

Uncertainty: It is unclear whether a configuration‑only approach exists to suppress duplicate entries without writing custom provider code or implementing manual deduplication logic.

• Is there a supported way to configure LoggerFilterOptions or the logging pipeline to deduplicate messages across providers?
• If not, what extension points allow a lightweight deduplication filter without rebuilding the ILoggerFactory?
• How can duplicate suppression be verified in a test harness without affecting production logging behavior?