0.5.1 - 2026-03-07

Added

• ${VAR-default} and ${VAR:-default} syntax in config env var substitution for fallback values when variables are unset
• Per-function metrics: fn.executions_total counter and fn.duration_seconds histogram with function name, kind, and status labels
• db.query tracing spans on DbConn methods (fetch_one, fetch_all, fetch_optional, execute) so database calls appear in traces
• db.transaction tracing span around transactional mutation lifecycle (BEGIN, handler, COMMIT)
• SSE connection tracking via active_connections gauge (increment on connect, decrement on disconnect)
• Per-signal env var control for observability: FORGE_OTEL_TRACES, FORGE_OTEL_METRICS, FORGE_OTEL_LOGS

Changed

• OTLP telemetry export disabled by default; enabled via FORGE_OTEL_ENABLED=true env var (docker compose sets this automatically)
• RPC request log demoted to debug level since fn.execute already logs at info with richer context
• Function input args demoted from info to debug level to reduce log noise and avoid PII exposure
• Removed redundant success field from function execution logs (message already distinguishes executed vs failed)
• Config templates use env var defaults (${FORGE_OTEL_ENABLED-false}) instead of hardcoded enabled = true