Incident Library
Applied filters Root causeCapacity exhaustionSymptomLoad imbalanceOrganisationMongoDBClear allEvery case under the filters, with no sentence; newest first.
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  1. IL-0287 One overloaded shard of MongoDB's internal monitoring database delayed Atlas metrics, alerts and cluster operations
    MongoDB2025
    Symptoms

    On 7 October 2025 MongoDB reported a delay in the metric ingestion pipeline of MongoDB Atlas and Cloud Manager. Metrics in Atlas dashboards arrived late or went missing, Host Down alerts did not fire, and Atlas cluster management operations such as provisioning and resizing were delayed, while customer clusters themselves stayed healthy and available.

    Monitoring outageDatabase overloadLoad imbalance
    Trigger

    The rollout of an updated internal software version caused a temporary spike in resource demand on the internal database cluster.

    Root cause
    Capacity exhaustion
    Component
    Database
    Contributing factor
    Inefficient queryNo headroom
    Remediation
    • Took corrective actions to stabilise the system and monitored their effect
    • Implemented a fix and monitored the results until the incident was resolved
    Action items
    • Shard the collections with concentrated load to spread traffic over more nodes
    • Optimise inefficient queries
    • Provision additional infrastructure capacity for higher traffic
    • Refine capacity planning to anticipate future load spikes, using metrics from this event
    • Redesign software rollouts to account for the predictable rise in resource demand during a rollout
    • Keep monitoring how the sharding and query changes resolve the hotspots
    • Expand the detection of elevated load conditions for faster anomaly detection and response
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This case involves Database. kubegap audits a Kubernetes cluster for gaps like these, read-only, from Claude Code or Codex; its checks cite public reports like the ones in this library.

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By root cause1

Capacity exhaustion1 case

Component
Database
Contributing factor
Inefficient queryNo headroom
Organisation
MongoDB
  1. IL-0287 One overloaded shard of MongoDB's internal monitoring database delayed Atlas metrics, alerts and cluster operations
    MongoDB2025