Pre-Ingest Observability Cost Firewall That Sits In Front Of Datadog, New Relic, And Honeycomb To Drop High-Cardinality Metrics Before They Become A $65 Million Bill

dev tool real project •• multiple requests

Datadog migration tools exist (SigNoz now ships a LLM-powered Datadog dashboard converter), but most teams aren't ready to rip out their observability stack... they just want the bill to stop scaling exponentially. The gap is an OpenTelemetry-compatible proxy that lives inside the cluster, monitors per-service ingest cost in real time, and automatically downsamples or aggregates high-cardinality tags (the per-customer or per-request-id labels that secretly explode billing) when a service crosses its monthly budget. Sell it as 'spend insurance' to mid-size teams burned once and unwilling to migrate yet.

builder note

The specific value is the cardinality killer. 90% of surprise observability bills come from one or two unintentional high-cardinality tags (user_id, trace_id baked into metric labels). Catch those, aggregate them, and you've saved the customer five figures... and they don't have to fire their on-call team to do it.

landscape (4 existing solutions)

The market splits into 'migrate off Datadog' (SigNoz, ClickStack, OneUptime, Grafana) and 'use a heavy enterprise pipeline' (Cribl). Nothing serves the mid-size SaaS team that wants a $99/mo sidecar to keep their existing vendor under control.

Datadog usage caps Quota alerts notify you AFTER you've already crossed a threshold for the month. There is no programmatic shutoff that drops outbound metric writes before they accrue cost.

OpenTelemetry Collector + tail-based sampling Can sample traces but requires hand-rolling cost-aware sampling rules per service. There is no out-of-the-box 'this is your monthly budget, enforce it' policy layer.

Cribl Stream Enterprise observability pipeline with cost reduction features, but priced for and aimed at large orgs with dedicated platform teams. Mid-size teams (50-200 engineers) get priced out before they can use it.

SigNoz Datadog migration tool Excellent if you've already decided to migrate. Doesn't help the team that has 18 months left on their Datadog contract and just needs the next bill to be smaller.

sources (3)

other https://www.velodb.io/blog/datadog-alternatives "Many engineers on Reddit frequently describe Datadog costs as difficult to predict." 2026-04-12

other https://signoz.io/blog/datadog-migration-tool/ "When a Hacker News thread about a single company's $65 million Datadog bill went viral, it unleashed a wave of similar complaints." 2026-03-10

other https://clickhouse.com/resources/engineering/datadog-alterna... "Open source options... worth serious consideration. You get logs, metrics, traces, and more without per-GB billing anxiety." 2026-04-05

observabilitydatadogcost-controlotelhigh-cardinality