Crate tracing_ecs
source ·Expand description
Tracing subscriber that outputs json log lines compatible with ECS (Elastic Common Schema).
More specifically, this crate provides a Layer
implementation that can be composed with an existing Subscriber
from the
tracing-subscribers
crate.
See how is implemented the install
method
to understand what’s done under the hood.
§How spans are handled
All spans attributes are directly appended to the final json object.
As a result, there might be duplicate keys in the resulting json if
static extra fields have the same keys as some span attributes, or if
an attribute is named message
(which shall be reserved to the logged event).
This behavior can be customized by implementing the AttributeMapper
trait.
§JSON Normalization
Output is normalized by default so there is no dot anymore in the resulting json keys. See https://www.elastic.co/guide/en/ecs/current/ecs-guidelines.html
See ECSLayerBuilder.normalize_json
§Examples
Install a default subscriber that outputs json to stdout:
use tracing_ecs::ECSLayerBuilder;
ECSLayerBuilder::default()
.stdout()
.install()
.unwrap()
Install a subscriber with custom extra fields that outputs
json to stdout (here we use the json!
macro but it accepts
anything that serializes to a json map):
use serde_json::json;
use tracing_ecs::ECSLayerBuilder;
ECSLayerBuilder::default()
.with_extra_fields(json!({
"labels": {
"env": "prod",
},
"tags": ["service", "foobar"]
}))
.unwrap()
.stdout()
.install()
.unwrap();
With attributes name mapping:
use tracing_ecs::ECSLayerBuilder;
use std::borrow::Cow;
use std::ops::Deref;
ECSLayerBuilder::default()
.with_attribute_mapper(
|_span_name: &str, name: Cow<'static, str>| match name.deref() {
"txid" => "transaction.id".into(),
_ => name,
},
).stdout().install().unwrap()
Structs§
- The final Layer object to be used in a
tracing-subscriber
layered subscriber. - Builder for a subscriber Layer writing ECS compatible json lines to a writer.
Enums§
Constants§
- This span_name is used when calling the current
AttributeMapper
while processing event attributes.
Traits§
- Map span attributes name to ECS field name