Add 'ssl' and 'gssapi' features in rdkafka

Author: vruello

Cargo.lock

@@ -78,6 +78,9 @@ For a given subscription, all events will be sent in the configured Kafka topic.
 > [!TIP]
 > If multiple outputs use the Kafka driver and connect to the same Kafka cluster, it is recommended to configure the additional options in OpenWEC settings (`outputs.kafka.options`) **and** to omit the `options` parameter in Kafka output configuration. This way, only one Kafka client will be used by all the outputs, which is more resource efficient.
 
+> [!tip]
+> OpenWEC bundles its own Kafka client (using `rdkafka`). It is built with `zstd`, `libz`, `external-lz4`, `ssl` and `gssapi` features (see https://github.com/fede1024/rust-rdkafka/blob/master/rdkafka-sys/README.md#features).
+
 #### Configuration
 
 ```toml
@@ -256,4 +259,4 @@ To add an output driver, you need to:
 - in `cli`:
     - add a subcommand to create an output using the driver in `cli::main` and handle it in `cli::subscriptions`.
     - add a config template of an output using the driver in `cli::skell`.
-- add documentation in `doc/outputs.md`.
+- add documentation in `doc/outputs.md`.

doc/outputs.md

@@ -23,7 +23,7 @@ mime = "0.3.17"
 quick-xml = "0.36.0"
 roxmltree = "0.20.0"
 tokio = { version = "1.41.0", features = ["full"] }
-rdkafka = { version = "0.36.0", features = ["zstd", "libz", "external-lz4"] }
+rdkafka = { version = "0.36.0", features = ["zstd", "libz", "external-lz4", "ssl", "gssapi"] }
 regex = "1.11.0"
 uuid = { version = "1.12.1", features = ["v4", "fast-rng"] }
 serde = { version = "1.0.164", features = ["derive", "rc"] }