All Systems Operational

Uptime over the past 90 days. View historical uptime.
Website Operational
90 days ago
99.97 % uptime
Today
API Operational
90 days ago
99.92 % uptime
Today
CDN Operational
90 days ago
99.95 % uptime
Today
Core Operational
90 days ago
99.93 % uptime
Today
MangaDex @ Home Operational
90 days ago
99.97 % uptime
Today
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance
Major outage
Partial outage
No downtime recorded on this day.
No data exists for this day.
had a major outage.
had a partial outage.

No incidents or maintenance related to this downtime.

May 17, 2026
Performance Issues
Resolved - This incident has been resolved.
May 17, 05:36 UTC
Monitoring - A proper fix has been implemented and we will closely monitor the status of the site over the coming hours.

Short postmortem:
- Computing title ratings site-wide is very expensive (mainly because of the usage of bayesian rating in this case),
- So this computation is done ahead of time, once per hour, and its result is stored in memory for quick access in the meantime,
- However the space we allocate in memory for this (& similar things) has grown and grown over time, and just today passed the maximum allocated total size for it, causing automatic eviction of some values from memory (Redis maxmem + lru eviction),
- When this value is missing, the site attempts to initialize it, and when it tries to do so multiple times per second it causes extreme strain on our databases, and in turn an outage
May 16, 19:04 UTC
Update - We have identified the likely cause of the issue. It has been mitigated for now and the site was reopened.
May 16, 17:40 UTC
Identified - We have identified the likely cause of the issue. It has been mitigated for now and the site was reopened.
May 16, 17:40 UTC
Investigating - MangaDex is experiencing significant performance issues, we are investigating to find the root cause.
May 16, 16:34 UTC
May 16, 2026
May 15, 2026

No incidents reported.

May 14, 2026

No incidents reported.

May 13, 2026

No incidents reported.

May 12, 2026

No incidents reported.

May 11, 2026

No incidents reported.

May 10, 2026

No incidents reported.

May 9, 2026

No incidents reported.

May 8, 2026

No incidents reported.

May 7, 2026

No incidents reported.

May 6, 2026

No incidents reported.

May 5, 2026

No incidents reported.

May 4, 2026

No incidents reported.

May 3, 2026

No incidents reported.

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