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Questions tagged [rust-tracing]

This tag should be used for the Rust tracing library and related crates.

41 questions
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Idiomatic way of tracing an object through your system with `tracing`?

Context: event-driven system where objects go through a bunch of subsystems (Tokio architecture, communication over channels). I want to have spans that track the object through the system, from start to finish. Is the idiomatic way to do this just…
boston
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tracing subscriber which async log function

I was planning on creating a new Layer for logging to gcp LogExplorer. Because we are working in rust, the api for logging is an async function call. The tracing Layer trait exposes on_event function which is not async, which is where the problem…
Sandeep Kumar Pani
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Is tracing intended to be used as I am using it? How can I trace errors chain?

I'm using async-graphql and axum. This is a reproduction of the issue: https://github.com/frederikhors/iss-async-graphql-error-handling. To start: cargo run If you open the GraphiQL client at http://localhost:8000, you can use the below query to…
Fred Hors
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Tracing, how to filter logs under specified levels for `Layer`?

Consider the following code, I am writing the log into both standard output and a file. This is approached by Layer, while I don't know how to filter based on level. pub fn trace() -> tracing_appender::non_blocking::WorkerGuard { let mut log_dir…
realzhujunhao
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Format tracing-rs log message with JSON in Subscriber/Layer

I'm using the tracing-rs crate for logging in my Rust application. Currently log messages are just printed to the console but I want them to be appended to a log file conditionally depending on the span. Some of the log messages are related to an…
binarybaron
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How to use `tracing-subscriber` Rust crate to build a mult-writer, global filter subscriber

I'm trying to build a logging setup using the tracing and tracing-subscriber. However I'm finding the tracing ecosystem incredibly abstract and hard to work with. I'm trying to create Subscriber that has - A top level filter based on the target.…
twitu
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How can I rename fields with the builtin json tracing subscriber?

The tracing json subscriber gives the following stdout out of the box: fn main() { tracing_subscriber::fmt() .json() .with_max_level(tracing::Level::DEBUG) .flatten_event(true) .init(); tracing::debug!("This…
VBar
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possible to avoid giant Handle type signature using rust tracing library?

I have a function that initializes a tracing subscriber, and returns a reloading Handle so that I can dynamically control the log level. The type signature works but is a nightmare (I copy-pasted it in from a compiler error message). Is there a…
ajp
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How to unify the time in the console and the file when using tracing-appender?

When I try to use tracing-appender, I notice that the time in the console does not match the time in the file. How can I get them to be the same time? use std::io; use std::path::Path; use tracing::{debug, error, info, trace, warn, Level}; use…
3moredays
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In Rust I use tracing wirte log to file. the file is created,but it is empty

In Rust I use tracing wirte log to file.While the app sleep, log file be created.the app finish ,the log file is empty. Code: pub fn tracing_init() { let env_filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info")); …
yan shen
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Test if a trace line was emitted

I am writing integration tests for a library and I want to test if in a certain scenario a particular trace line was emitted. I see how tracing-test can capture a trace within a test step, I had a look at tracing-fluent-assertions and test-log, but…
fleetingbytes
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How to send traces from rust + tracing_opentelemetry to Honeycomb?

I've set up a basic subscriber for Rust tracing with OpenTelemetry as follows: let rust_log = dotenv::var("RUST_LOG").unwrap(); if rust_log == "OTEL" { // Use OpenTelemetry subscriber let tracer = stdout::new_pipeline().install_simple(); …
Peteris
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How can I get/store span duration with Rust tracing?

I want to capture the duration of execution of a span in rust tracing and send that as metric. I have found that fmt() helps in printing that as mentioned here:How can I log span duration with Rust tracing? I have also tried this example about…
Sameer Shinde
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Can't compile since opentelemetry and opentelemetry-jaeger update

I have this function that is working perfectly fine with opentelemetry = { version = "0.17", features = ["tokio"] } and opentelemetry-jaeger = { version = "0.16", features = ["rt-tokio"] } pub fn get_subscriber(name: String, env_filter: String) ->…
Eric
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Why is nothing printed to the terminal when using tracing-appender?

I do not understand why this code doesn't print anything on my terminal: use tracing::info; fn main() { init(); info!("test me"); println!("i should have info! message before this") } pub fn init() { let (non_blocking, _guard) =…
Fred Hors
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