Spikelog

Hi all!I built Spikelog because I kept wanting to track simple numbers over time but every time I looked at proper observability tools, I'd bounce off the setup complexity. I wanted to make something that didn't require a lot of thinking to use.Spikelog is made to be as simple as possible:- POST a JSON with chart name + value (you can add some tags as well but I've not tested this part works yet)- Chart appears automatically- 1,000 point rolling window per chart (old data expires, no retention config)- Max 10 chartsThat's basically the whole product.I built it in about a day using Cursor. The API is intentionally minimal so AI assistants can use it too.I have a prompt that lets your coding agent analyze a codebase and add tracking automatically (after you approve the plan).I used it to make Spikelog track itself: https://spikelog.com/p/spikelogThere's no alerting yet (that's next), no complex aggregations, no dashboards beyond the auto-generated charts. If you need real observability use something fully featured like Axiom or Datadog. This is for people who just want to see if a number went up or down and don't want to build that themselves. i.e. they want something slightly better than just logging the number.You can also share the charts publicly and I might add some password protection if there is demand for that.I haven't battle-tested it under heavy load. The rolling window deletion is naive (deletes oldest points on insert). There are probably edge cases I haven't hit yet.Would love feedback, especially if you try it and hit something broken.