February 2026 - syslog-ng - lists.balabit.hu

syslog-ng version 4.11.0 is now available
by Peter Czanik (pczanik) 25 Feb '26

25 Feb '26

Hi, I'm happy to share that syslog-ng version 4.11.0 is now available. 4.11.0 syslog-ng provides RPM<https://github.com/syslog-ng/syslog-ng#rhel> and DEB<https://github.com/syslog-ng/syslog-ng#debianubuntu> package repositories for Ubuntu, Debian, and RHEL, for both amd64 and arm64 architectures. We also provide ready-to-test binaries in Docker containers<https://hub.docker.com/r/balabit/syslog-ng/tags> based on the current stable Debian image. For more details, visit our Documentation Center<https://syslog-ng.github.io/> Highlights * kafka-source(): The new kafka() source can directly fetch log messages from the Apache Kafka message bus using the librdkafka client. It can fetch messages from explicitly named or wildcard-matching Kafka topics, and from a single partition, explicitly listed partitions, or all partitions of the selected topic(s). It supports the two main strategies — assign and subscribe — providing the flexibility to adapt to a wide range of Kafka setups and practical use cases, instead of forcing a single approach that may not fit all scenarios. It can fetch and process messages from the Kafka broker using multiple workers(), which may further improve throughput, especially when the main worker can fetch messages at high speed. For more details<https://syslog-ng.github.io/admin-guide/060_Sources/038_Kafka/README> and for all available options<https://syslog-ng.github.io/admin-guide/060_Sources/038_Kafka/001_Kafka_opt…>, please see our documentation. (#5564<https://github.com/syslog-ng/syslog-ng/pull/5564>) Features * cloud-auth: Add generic OAuth2 authentication module A generic OAuth2 authentication module supporting client credentials flow with configurable authentication methods (HTTP Basic Auth or POST body credentials) has been added. The module is extensible via virtual methods, allowing future authenticators to inherit common OAuth2 token management logic. (#5571<https://github.com/syslog-ng/syslog-ng/pull/5571>) * cloud-auth, grpc: Add OAuth2 support for gRPC destinations The cloud-auth() plugin now supports gRPC destinations in addition to HTTP destinations. This enables OAuth2 token management for any gRPC-based destination driver (such as bigquery(), opentelemetry(), loki(), etc.). The implementation uses the same signal/slot pattern as HTTP. Example configuration: destination d_grpc { opentelemetry( url("example.com:443") cloud-auth( oauth2( client_id("client-id") client_secret("client-secret") token_url("https://auth.example.com/token") scope("api-scope") ) ) ); } (#5584<https://github.com/syslog-ng/syslog-ng/pull/5584>) * darwinosl(): Added (fixed in an alternative way and enabled) the log-fetch-limit() option, which allows batched message forwarding in the log path. The fetch-delay() and fetch-retry-delay() options have both been renamed with the log- prefix; the old keywords are still supported but marked as deprecated. The enhanced internal loop for OSLog message processing now uses fewer resources during both processing and idle time. (#5547<https://github.com/syslog-ng/syslog-ng/pull/5547>) * network-load-balancer: add support for failover The confgen script for network-load-balancer now supports failover, generating the list of failover servers for each destination automatically. (#5562<https://github.com/syslog-ng/syslog-ng/pull/5562>) * file(), wildcard-file() source: Add auto follow-method() option A new follow-method() option, auto, has been added. In this automatic mode, syslog-ng OSE uses the following sequence to decide which method to use: Unfortunately, for backward compatibility reasons, the new auto option could not become the default at this time, but for new configurations, we recommend using monitor-method("auto") and follow-method("auto") to achieve the best available performance on the given platform. (#5602<https://github.com/syslog-ng/syslog-ng/pull/5602>) * the inotify method is used automatically if the system supports it (and none of the IV_SELECT_POLL_METHOD or IV_EXCLUDE_POLL_METHOD environment variables are set); otherwise * the best available (or the IV_SELECT_POLL_METHOD or IV_EXCLUDE_POLL_METHOD forced) system (ivykis) poll method of the platform is used; if none is available, * the old poll method is used * network()/syslog(): Add extended-key-usage-verify() option to TLS sources and destinations (#5588<https://github.com/syslog-ng/syslog-ng/pull/5588>) * Number parsing: Improve @NUMBER@ / @DOUBLE@ support for signed numbers When parsing numbers using the @NUMBER@ or @DOUBLE@ pattern parsers, certain signs were not allowed, causing PatternDB to reject properly formatted numbers. Explicit + signs at the beginning of a number or in the exponent part were rejected, and a - sign before a hexadecimal value was also not accepted. (#5620<https://github.com/syslog-ng/syslog-ng/pull/5620>) * elasticsearch, opensearch: Update SCL to support data streams (#5586<https://github.com/syslog-ng/syslog-ng/pull/5586>) * elasticsearch-http() and opensearch() now support data streams when using the op_type("create") parameter * the type("") parameter can now be omitted, and its value is silently ignored Bugfixes * json-parser: Fixed quoting of JSON array elements containing commas. (#5604<https://github.com/syslog-ng/syslog-ng/pull/5604>) * transport(proxied-tcp): Fixed an internal assertion–caused crash when a Proxy Protocol v2 message was received with a LOCAL command that was not handled previously. LOCAL commands are now treated as health check messages for both v1 and v2 proxy messages — accepted but dropped — as the protocol definition<https://github.com/syslog-ng/syslog-ng/blob/syslog-ng-4.11.0/www.haproxy.or…> specifies. (#5608<https://github.com/syslog-ng/syslog-ng/pull/5608>) * afsocket-source: Fixed two keep-alive() configuration reload–related issues. First, when a reload switched from keep-alive(yes) to keep-alive(no) with so-reuseport(no), the newly loaded configuration’s socket instance could fail to open. Second, in case of an error in the new configuration, the reload could fail to properly restore the previous connection state. (#5552<https://github.com/syslog-ng/syslog-ng/pull/5552>) * log-transport-tls: TLS-related macros, such as ${tls.x509_cn}, were not set in the first log message. (#5603<https://github.com/syslog-ng/syslog-ng/pull/5603>) * stats: Fixed stats reset memory counter underflow. (#5563<https://github.com/syslog-ng/syslog-ng/pull/5563>) * afsocket-source: Added a workaround for an issue where a reload switches from keep-alive(yes) to keep-alive(no) with so-reuseport(no), causing the newly loaded configuration’s socket instance to fail to open. (#5552<https://github.com/syslog-ng/syslog-ng/pull/5552>) Credits syslog-ng is developed as a community project, and as such it relies on volunteers, to do the work necessarily to produce syslog-ng. Reporting bugs, testing changes, writing code or simply providing feedback are all important contributions, so please if you are a user of syslog-ng, contribute. We would like to thank the following people for their contribution: AshFungor, Bálint Horváth, Peter Czanik (CzP), davidtosovic-db, egglessness, Daniele Ferla, Hofi, Tamas Pal, Romain Tartière, Fᴀʙɪᴇɴ Wᴇʀɴʟɪ — This release has 3 assets: * syslog-ng-4.11.0.tar.gz * Source code (zip) * Source code (tar.gz) Visit the release page<https://github.com/syslog-ng/syslog-ng/releases/tag/syslog-ng-4.11.0> to download them. Peter Peter Czanik (CzP) <peter.czanik(a)oneidentity.com> Balabit (a OneIdentity company) / syslog-ng upstream https://syslog-ng.com/community/ https://twitter.com/PCzanik

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Plans for next release?
by David Tosovic 24 Feb '26

24 Feb '26

Hi all, I'm currently building syslog-ng from source as I'm utilizing some recent changes that are not in 4.10.2. I'm wondering if the next release is scheduled soon? Thanks, David

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The syslog-ng Insider 2026-02: stats-exporter; blank filter; Kafka source
by Peter Czanik (pczanik) 12 Feb '26

12 Feb '26

Dear syslog-ng users, This is the 137th issue of syslog-ng Insider, a monthly newsletter that brings you syslog-ng-related news. NEWS The syslog-ng stats-exporter() now has all functionality of syslog-ng-ctl The syslog-ng stats-exporter() allows you to collect syslog-ng statistics using Prometheus. Version 4.10 of syslog-ng added options to ensure that all related options of syslog-ng-ctl are now available in stats-exporter() too. https://www.syslog-ng.com/community/b/blog/posts/the-syslog-ng-stats-export… Using the blank() filter of syslog-ng The blank() filter is a filter function with a descriptive name: it selects empty or undefined name-value pairs. While most of the functionalities that blank filter provides are available long time ago, using this new filter makes configurations easier to understand. https://www.syslog-ng.com/community/b/blog/posts/using-the-blank-filter-of-… How to test the syslog-ng Kafka source by building the package yourself? A long-waited feature for syslog-ng, the Kafka source, is getting ready soon. The development is still in progress, but you can already try it, and it is worth the effort. How? Using the very same tool the syslog-ng testing and release process relies on. https://www.syslog-ng.com/community/b/blog/posts/how-to-test-the-syslog-ng-… WEBINARS * You can learn about upcoming webinars and browse recordings of past webinars at https://www.syslog-ng.com/events/ Your feedback and news, or tips about the next issue are welcome. To read this newsletter online, visit: https://syslog-ng.com/blog/ Peter Czanik (CzP) <peter.czanik(a)oneidentity.com> Balabit (a OneIdentity company) / syslog-ng upstream https://syslog-ng.com/community/ https://twitter.com/PCzanik

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