The Prometheus label that blew our monitoring bill out 6x
A recent incident at Buildkite saw their Prometheus monitoring bill surge from $1,800 to over $11,000 in a month due to a single high-cardinality label. The label, which tracked unique build IDs, resulted in millions of time series being generated, significantly increasing costs. The team implemented new rules to avoid similar issues in the future by managing label cardinality more effectively.
- ▪Buildkite's monitoring bill increased sixfold due to a single Prometheus label.
- ▪The label added unique build IDs, leading to millions of active time series.
- ▪The team adjusted their monitoring practices to prevent high-cardinality labels from inflating costs.
DEV.to (Top) files mainly under programming. We currently carry 4,924 of its stories.
Story provenance
Source · retrieval · rights · ranking — open for full record
inspect →
Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/claire_nguyen/the-prometheus-label-that-blew-our-monitoring-bill-out-6x-57hj |
| Publication time | Fri, 29 May 2026 04:21:15 +0000 |
| Retrieval time | 2026-05-29T04:29:41.942Z |
| Last seen | 2026-05-29T04:29:41.942Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | EzNT4U8sFl40 |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3864932) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } claire nguyen Posted on May 29 The Prometheus label that blew our monitoring bill out 6x #devops #infrastructure #sre TL;DR: Our metrics bill went 6x in a single month. Traffic was flat. One Prometheus label carrying per-build IDs spawned millions of time series, and the backend charges by active series. Here's how we caught it and the label rules we run now so it doesn't happen again. The bill, not the traffic I'm on the infra team at Buildkite.
…
Excerpt limited to ~120 words for fair-use compliance. The full article is at DEV.to (Top).
Discussion
0 commentsMore from DEV.to (Top)
