Best LLM Observability Newsletters in 2026
NewsletterFIT tracks 4 newsletters that cover LLM observability as a primary topic, all with posts in the last 90 days. By publicly shown subscriber count, the largest are charugupta (1K) and Tech Founder Stack (1K).
Updated Nov 12, 2026 · sorted by publicly shown subscribers · methodology
- 1charugupta1K subscribers
SubstackMonthly or less · last post 8 days ago
I write about growth, both personal and professional. Specifically, startups in India I dream, learn, and do new things. Because what's life without a new dream?
Likely audience: AI engineers
- 2Tech Founder Stack1K subscribers
SubstackMonthly or less · last post 25 days ago
From recent posts: The author shares the story of open-sourcing Holo, a self-hostable shared context layer for AI agents, detailing the engineering decisions and design bets made to build it from an internal tool at Kombo. The article foc…
Likely audience: Technical founders building AI agents
- 3
SubstackWeekly · last post 7 days ago
From recent posts: The article covers debugging LLM issues that occur after model output, including policy agent handoffs, batch job notifications, latency tracking, and coding agent credential exposure. It also introduces an Obsidian vau…
Likely audience: ML engineers
- 4
SubstackMonthly or less · last post Aug 26, 2026
From recent posts: The article explains why traditional observability tools fail in agent systems due to non-determinism, highlighting issues like silent failures and transient errors caused by stochastic model behavior.
Likely audience: ML engineers
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