# Buildkite: Major incident: Increased latency on REST and GraphQL APIs

**Summary:** Buildkite reported a major incident involving increased REST and GraphQL API latency for all customers, starting 2026-06-11 23:18 UTC and resolved 2026-06-12 00:16 UTC (57 min). Buildkite attributed the issue to elevated REST API service load and confirmed recovery after mitigation; the agent and stacks API were unaffected. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2026-06-11 23:18 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/43sd7wry4r3k](https://stspg.io/43sd7wry4r3k)
- [Company: Buildkite](https://rewindex.com/company/buildkite.md)
- Versions: before (none: first archived) → after incident\_version:178/6tr7whjn0vl8@62beddec904f
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Increased latency on REST and GraphQL APIs
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-06-11 23:18 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-06-12 00:16 UTC
```

**6. Added: Affected components**

```diff
+ Remote MCP Server, REST API, REST API - Remote MCP Server, REST API - REST API
```

**7. Added: Update** (investigating) · 2026-06-11 23:18 UTC

```diff
+ We're observing increased latency for all our customers. We're currently investigating and will provide status updates as they become available.
```

**8. Added: Update** (monitoring) · 2026-06-11 23:49 UTC

```diff
+ We've isolated the issue to elevated load on our REST API service and are working to mitigate. The agent and stacks API isn’t affected.
```

**9. Added: Update** (monitoring) · 2026-06-11 23:51 UTC

```diff
+ We've isolated the issue to elevated load on our REST API service and have mitigated the issue. The agent and stacks API isn’t affected.
```

**10. Added: Update** (resolved) · 2026-06-12 00:16 UTC

```diff
+ The mitigation applied before the last update had the intended effect, and we have seen recovery in REST API latency.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-06-11 23:18 UTC | Major incident: Increased latency on REST and GraphQL APIs (this change) | degradation |

All Buildkite changes: [timeline](https://rewindex.com/company/buildkite/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/i31ae7faaa4fab9 · Markdown: https://rewindex.com/change/i31ae7faaa4fab9.md · JSON: https://rewindex.com/api/v1/changes/i31ae7faaa4fab9 · Generated 2026-10-18T02:54:10.433Z