# Diagram rendering degradation, June 2026

| **Severity** | Degradation            |
| ------------ | ---------------------- |
| **Duration** | Around 8 hours         |
| **Scope**    | Diagram rendering only |

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## What happened

On 17 June 2026 our diagram rendering service returned a growing number of errors. Affected diagrams showed an error state or appeared blank, and earlier in the window a refresh would often draw them correctly.

Only rendering was affected. Editing, storage and every other part of the product continued to work normally, and no diagram content was lost.

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## Timeline (UTC)

| **Time**      | **Event**                                                                           |
| ------------- | ----------------------------------------------------------------------------------- |
| 06:30         | Rendering began returning intermittent errors, with most requests still succeeding  |
| 06:30 - 14:30 | The error rate rose steadily through the morning as the capacity shortfall worsened |
| 14:30         | The error rate peaked, with most diagram requests failing                           |
| 15:00         | We identified the cause and applied a fix. Rendering recovered shortly afterwards   |

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## How you would have known

* PlantUML, Mermaid or BPMN diagrams showing an error instead of the drawing
* Diagrams appearing blank on a page that was fine the day before
* A refresh fixing it, early in the window

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## Customer data

ℹ️

No customer data was affected. The diagram source is stored in your own Confluence site and was never touched; only the live rendering of it failed.

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## Resolution

Diagrams drew normally again once the fix was applied. No action was needed from customers.

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## Related

[Interactive diagram issues, July 2026Another incident report.](https://help.gocapable.com/trust/interactive-diagram-issues-july-2026.html)

[Intermittent content search failures, January 2026Another incident report.](https://help.gocapable.com/trust/intermittent-content-search-failures-january-2026.html)

[Service incidentsEvery report.](https://help.gocapable.com/trust/service-incidents.html)

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_Written up, kept, and linked from the docs._