4.5.0

You can read more about the new features in the AxoSyslog documentation.

Highlights

Sending log messages to OpenObserve

The openobserve-log() destination feeds OpenObserve via the JSON API.

Example config:

openobserve-log(
    url("http://openobserve-endpoint")
    port(5080)
    stream("default")
    user("root@example.com")
    password("V2tsn88GhdNTKxaS")
);

(#4698)

Sending messages to Google Pub/Sub

The google-pubsub() destination feeds Google Pub/Sub via the HTTP REST API.

Example config:

google-pubsub(
  project("syslog-ng-project")
  topic("syslog-ng-topic")
  auth(
    service-account(
      key("/path/to/service-account-key.json")
    )
  )
);

See the Google Pub/Sub documentation to learn more about configuring a service account.
(#4651)

Parsing PostgreSQL logs

The postgresql-csvlog-parser(): add a new parser to process CSV log formatted by
PostgreSQL (https://www.postgresql.org/docs/current/runtime-config-logging.html).
The CSV format is extracted into a set of name-value pairs.
(#4586)

Features

http(): Added support for using templates in the url() option.
In syslog-ng a template can only be resolved on a single message, as the same
template might have different resolutions on different messages. A http batch
consists of multiple messages, so it is not trivial to decide which message should
be used for the resolution.
When batching is enabled and multiple workers are configured it is important to
only batch messages which generate identical URLs. In this scenario one must set
the worker-partition-key() option with a template that contains all the templates
used in the url() option, otherwise messages will be mixed.
For security reasons, all the templated contents in the url() option are getting
URL encoded automatically. Also the following parts of the url cannot be templated:
- scheme
- host
- port
- user
- password
  (#4663)
$TRANSPORT: this is a new name-value pair that syslog-ng populates
automatically. It indicates the "transport" mechanism used to
retrieve/receive the message. It is up to the source driver to determine
the value. Currently the following values were implemented:
BSD syslog drivers: tcp(), udp() & network()
- rfc3164+tls
- rfc3164+tcp
- rfc3164+udp
- rfc3164+proxied-tls
- rfc3164+<custom logproto like altp>
UNIX domain drivers: unix-dgram(), unix-stream()
- unix-stream
- unix-dgram
RFC5424 style syslog: syslog():
- rfc5426: syslog over udp
- rfc5425: syslog over tls
- rfc6587: syslog over tcp
- rfc5424+<custom logproto like altp>: syslog over a logproto plugin
Other drivers:
- otlp: otel() driver
- mqtt: mqtt() driver
- hypr-api: hypr-audit-source() driver
$IP_PROTO: indicate the IP protocol version used to retrieve/receive the
message. Contains either "4" to indicate IPv4 and "6" to indicate IPv6.
(#4673)
network() and syslog() drivers: Added ignore-validity-period as a new flag to ssl-options().
By specifying ignore-validity-period, you can ignore the validity periods
of certificates during the certificate validation process.
(#4642)
tls() in udp()/tcp()/network() and syslog() drivers: add support
for a new http() compatible ssl-version() option. This makes the TLS
related options for http() and other syslog-like drivers more similar. This
requires OpenSSL 1.1.0.
(#4682)
cloud-auth(): Added a new plugin for drivers, which implements different cloud related authentications.
Currently the only supported authentication is GCP's Service Account for the http() destination.
Example config:
```
http(
  cloud-auth(
    gcp(
      service-account(
        key("/path/to/service-account-key.json")
        audience("https://pubsub.googleapis.com/google.pubsub.v1.Publisher")
      )
    )
  )
);
```
(#4651)
csv-parser(): allow parsing the extracted values into matches ($1, $2, $3 ...)
by omitting the columns() parameter, which normally specifies the column
names.
(#4678)
--check-startup: a new command line option for syslog-ng along with the
existing --syntax-only. This new option will do a complete configuration
initialization and then exit with exit code indicating the result. Since
this also initializes things like network listeners, it will probably not
work when there is another syslog-ng instance running in the background. The
recommended use of this option is a dedicated config check container, as
explained in #4592.
(#4646)

Bugfixes

s3: Fixed an ImportError.
ImportError: cannot import name 'SharedBool' from 'syslogng.modules.s3.s3_object'
(#4700)
loki(): fixed mixing non-related label values
(#4713)
type hinting: Parsing and casting fractions are now done locale independently.
(#4702)
metrics-probe(): Fixed a crash.
This crash occurred when a metrics-probe() instance was used in multiple source threads,
like a network() source with multiple connections.
(#4685)
flags() argument to various drivers: fix a potential crash in case a flag with at least 32 characters is used.
No such flag is defined by syslog-ng, so the only way to trigger the crash is to use an invalid configuration file.
(#4689)
Fix $PROTO value for transport(tls) connections, previously it was set
to "0" while in reality these are tcp connections (e.g. "6").
Fix how syslog-ng sets $HOST for V4-mapped addresses in case of IPv6 source
drivers (e.g. udp6()/tcp6() or when using ip-protocol(6) for tcp()/udp()).
Previously V4-mapped addresses would be represented as
"::ffff:<ipv4 address>". This is not wrong per-se, but would potentially
cause the same host to be represented in multiple ways. With the fix,
syslog-ng would just use "<ipv4 address>" in these cases.
(#4673)
db-parser(): support nested match characters in @QSTRING@ pattern parser
(#4717)

Other changes

LogSource and LogFetcher: additional documentation was added to these
Python classes to cover explicit source-side batching functionalities (e.g.
the auto_close_batch attribute and the close_batch() method).
(#4673)
rate-limit(): Renamed the template() option to key(), which better communicates the intention.
(#4679)
templates: The template-escape() option now only escapes the top-level template function.
Before syslog-ng 4.5.0 if you had embedded template functions, the template-escape(yes) setting
escaped the output of each template function, so the parent template function received an
already escaped string. This was never the intention of the template-escape() option.
Although this is a breaking change, we do not except anyone having a config that is affected.
If you have such a config, make sure to follow-up this change. If you need help with it, feel
free to open an issue or discussion on GitHub, or contact us on the Axoflow Discord server.
(#4666)
loki(): The timestamp() option now supports quoted strings.
The valid values are the following, with or without quotes, case insensitive:
- "current"
- "received"
- "msg"
  (#4688)

syslog-ng Discord

For a bit more interactive discussion, join our Discord server:

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:

Attila Szakacs, Balazs Scheidler, Cedric Arickx, Fabrice Fontaine,
Hofi, László Várady, Romain Tartière, Szilard Parrag, yashmathne

syslog-ng/syslog-ng syslog-ng-4.5.0 on GitHub