Picking a managed metrics dashboard for a small Node.js startup

TL;DR If you're a five-person startup shipping a Node.js API and you want a metrics dashboard by Friday, send your telemetry to a managed backend and keep only the instrumentation layer inside your own repo. The alternative — standing up a time-series database, an object store for long-term blocks, and a dashboard service — puts three more components on an on-call rotation that hasn't earned its first SLO yet. Settle the wire format now and treat the backend as a config line you can change later. I own the platform team's roadmap, which in practice means I'm the person who defends the monitoring bill in a budget review and also the person who gets paged when a disk fills at 03:00. Those two jobs pull in opposite directions, and most of the advice online is written by people who only hold one of them. Usually the pager wins the argument. Should a startup run its own metrics stack, or pay for a managed dashboard? Start with capacity, because that's the step everyone skips before signing anything. A moderately instrumented Node.js API — say 40 HTTP routes, two queue workers, default runtime and event-loop metrics, one latency histogram with ten buckets — sits somewhere around 3,000 to 8,000 active series per process. Multiply by replicas. Multiply again by every environment you keep alive, including the staging cluster nobody admits to. You are at 50k active series before a single engineer has written a custom counter, and a self-hosted scraper will chew through that on a 2 GB VM without noticing. It will still be fine at 500k. Past a few million active series you're into sharding, remote storage, and a retention argument with whoever pays for object storage — that's the point where the self-hosted route stops being free and turns into a project with a headcount attached. None of that work is hard. It's just never zero. Dimension Self-hosted stack Managed metrics backend Time to first dashboard 1–3 days under an hour Who owns retention you, plus the storage bill vendor