aselimc Structured Logging
Standard Fields
Every log entry: timestamp, level, module, message, context
Python
import structlog
logger = structlog.get_logger()
logger.info("training_step", epoch=5, loss=0.42, lr=1e-4)
Or stdlib with JSON formatter:
import logging, json
logging.basicConfig(format='%(message)s')
Node.js
import pino from 'pino';
const logger = pino();
logger.info({ epoch: 5, loss: 0.42 }, 'training_step');
Rules
- JSON format in production, human-readable in dev
- Include correlation/request IDs for distributed traces
- Log levels: DEBUG (dev only), INFO (normal ops), WARNING (degraded), ERROR (failures), CRITICAL (system down)
- Never log secrets, tokens, or PII