crabka-logfmt

Structured-JSON tracing log formatter shared across Crabka services (broker, gRPC gateway, operator, schema-registry).

It installs a stdout fmt layer whose events are emitted as one JSON object per line, shaped for Google Cloud Logging (GKE):

{"timestamp":"2026-06-13T05:55:09.951788Z","severity":"INFO","target":"crabka_broker::network::dispatch","message":"connection opened","listener":"PLAIN","sasl":false}

• severity is mapped from the tracing level (WARN → WARNING, TRACE → DEBUG) so Cloud Logging sets the entry's LogSeverity.
• message and all event fields are flattened to the top level so the message becomes the entry summary and fields stay queryable.
• No ANSI colour codes — unlike the default tracing_subscriber fmt layer, which colourises even when stdout is not a terminal.

Usage

use tracing_subscriber::{prelude::*, EnvFilter};

let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info"));
tracing_subscriber::registry()
    .with(crabka_logfmt::layer(filter, std::io::stdout))
    .init();