ObservabilityCVI · Log Ingestion IncidentLogIngestionIncident
Loki Capacity Incident
What you'll learn
- Explain in production terms
- Apply the discipline to a real environment
Prerequisites
Verified against Prometheus 2.55.x · Alertmanager 0.28.x · node_exporter 1.8.x · blackbox_exporter 0.26.x · Grafana 11.x · Loki 3.x · Tempo current · OpenTelemetry Collector 0.110.x · Grafana Alloy current · Docker Engine 28.x · Ubuntu 24.04 LTS · Debian 12 (Bookworm) · RHEL / Rocky / AlmaLinux 9.x · 2026-08-13
A Loki storage capacity incident requires immediate action: drop streams or scale object storage.
What it is
A precise definition scoped to production operations.
Why a sysadmin cares
Production framing.
How it works
The mental model.
example_setting: valueHow to configure it
Real configuration examples.
promtool check config /etc/prometheus/prometheus.ymlHow to validate it
Commands the operator runs to confirm the configuration is live and correct.
How it can fail
Failure modes: silent misconfiguration, crash on load, performance regression, permissions failure, schema / version drift.
How to troubleshoot it
Diagnostic order: was it working before? what does the service view say? what does the platform view say? form hypothesis, find evidence, test, validate.
Security implications
The topic has security implications wherever the relevant component exposes an HTTP endpoint, an authentication layer, or a credential.
Performance implications
Performance implications come from cardinality, scrape / push interval, rule size, retention, and query cost.
Production guidance
- Validate before applying.
- Test in non-production.
Verification
- What is the topic in production terms?
- Why does a sysadmin care?
- How does it fail and how do you diagnose the failure?
Quiz
Knowledge check · 8 questions
Q1. What is the primary purpose of loki capacity incident?
Q2. Which failure mode of loki capacity incident is most operationally costly?
Q3. Production verification should run on production hosts.
Q4. First response when loki capacity incident misbehaves?
Q5. Name one signal that confirms loki capacity incident is healthy.
Q6. Which of these are validation steps?
Q7. Right discipline when changing in production?
Q8. Telemetry usefulness requires:
Passing score: 75%. Answers are checked in this browser.