observability

Structured contextual logging and tracing for AIngle

---

Overview

Structured contextual logging built on tracing. This crate provides experimental observability features for AIngle distributed systems, including console output, JSON logging, and span filtering.

Features

• Structured logging - Context-aware log events with spans
• Multiple outputs - Console, JSON, and custom formatters
• Powerful filtering - Filter by module, span, or field values
• Zero-cost abstractions - Disabled spans compile to no-ops

Installation

[dependencies]
observability = "0.1"

Quick Start

Console Logging

# Simple logging
RUST_LOG=trace cargo run
# Filtered logging
RUST_LOG='core[a{something="foo"}]=debug' cargo run

JSON Output

RUST_LOG='core[{}]=debug' cargo run --structured Json > log.json

Filter Syntax

# Module + span + field filtering
RUST_LOG='core[a{something="foo"}]=debug'# Multiple filters
RUST_LOG='[{}]=error,[{something}]=debug'

Component	Description
core	Module path filter
[a]	Span name filter
{field="value"}	Field value filter
=debug	Minimum log level

JSON Output

{
"time": "2024-01-01T00:00:00.000Z",
"name": "event",
"level": "INFO",
"target": "my_module",
"file": "src/lib.rs",
"line": 42,
"fields": {"message": "Hello"},
"spans": [{"name": "request", "id": 1}]
}

Useful Tools

Tool	Purpose
jq	JSON processing
json2csv	Convert to CSV
tad	CSV viewer

Resources

• Why Tracing? (Video)
• Tokio Tracing Blog
• EnvFilter Documentation

Part of AIngle

This crate is part of the AIngle ecosystem - a Semantic DAG framework for IoT and distributed AI applications.

License

Licensed under the MIT License. See LICENSE for details.

---

_{Maintained by Apilium Technologies - Tallinn, Estonia}