EC2 Burstable Instance Low CPU Credits
The instance is running out of burst credits, so it is throttled to its baseline and the application slows down for a reason the CPU graph does not explain.
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AWS
Found, explained, handed over.
What we would change and why, with no savings claim and no policy behind it.
Detect
ZopNight checks this automatically across AWS, with read-only access to the account.
Explain
Every finding says exactly what to change: Change burstable EC2 instance type.
Fix
The finding opens with the fix already written out, step by step, so it is one ticket, not an investigation.
- Applies to
- EC2 Instances on AWS
- The fix, by hand
- Check CPUCreditBalance and CPUSurplusCreditBalance in CloudWatch.
- Enable T3/T4g unlimited mode to avoid throttling (pay per vCPU-hour over baseline).
- Or upgrade to a fixed-performance instance (m5, c5) if sustained high CPU.
- Monitor after change to verify performance improvement.
These are the steps the finding carries in the product.
- Category
- Performance. A measured bottleneck worth clearing: throttled operations, undersized tiers, a workload near its limit.
- Where it appears
- The Advisory tab of Recommendations, with every affected resource listed.
- Rule ID
RC-188- Full reference
Related checks
See the performance findings in your account.
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- $30M+annualised cloud spend under management
- 550K+resources tracked since launch
- 20-60%off the bill in the first month
- SOC 2Type II report, plus ISO 27001
Figures published on zop.dev.