---
title: "log: Filter and route log messages using log paths, flags, and filters"
url: "https://axoflow.com/docs/axosyslog-core/4.28/chapter-routing-filters/"
description: "Build log paths that route messages from sources to destinations, select messages with filters, and manage flow-control and disk buffers."
last_modified: "2026-10-01T14:05:08+02:00"
---

> For the complete documentation index, see [llms.txt](https://axoflow.com/docs/axosyslog-core/4.28/llms.txt).

# log: Filter and route log messages using log paths, flags, and filters

Build log paths that route messages from sources to destinations, select messages with filters, and manage flow-control and disk buffers.

> **FilterX or classic filters, parsers, and rewrite rules?:**
> [FilterX](https://axoflow.com/docs/axosyslog-core/4.28/filterx/index.md) replaces filters, parsers, and rewrite rules with a single typed language that can also handle nested JSON and other complex data. You don’t have to migrate: the classic blocks keep working, and you can use both in the same log path. To convert your existing configuration, see [Update filters to FilterX](https://axoflow.com/docs/axosyslog-core/4.28/filterx/update-filters/index.md).

---

[Log paths](https://axoflow.com/docs/axosyslog-core/4.28/chapter-routing-filters/logpath/index.md)

[Managing incoming and outgoing messages with flow-control](https://axoflow.com/docs/axosyslog-core/4.28/chapter-routing-filters/concepts-flow-control/index.md)

[Using disk-based and memory buffering](https://axoflow.com/docs/axosyslog-core/4.28/chapter-routing-filters/concepts-diskbuffer/index.md)

[Filters](https://axoflow.com/docs/axosyslog-core/4.28/chapter-routing-filters/filters/index.md)

[Dropping messages](https://axoflow.com/docs/axosyslog-core/4.28/chapter-routing-filters/example-dropping-messages/index.md)

Last modified October 1, 2026: [Move filterx chapter higher and link it from classical pages (4a7e94c3)](https://github.com/axoflow/axosyslog-core-docs/commit/4a7e94c3b1f2b935d1aa686abff2c9ee95b863bd)