AI Observability 2026
Why - Track every call - Debug failures - Optimize cost - Detect quality drift Tools - LangSmith: Anthropic + LangChain - Helicone: provider-agnostic - PromptLayer: prompt-focused - Langfuse: open-source - OpenLLMetry: standards-based What to Log - Input + output - Model + version - Tokens in/out - Latency - User ID - Tags feature, env What to Alert - Latency p99 threshold - Cost spike - Error ra…