Cloud cost investigation

You investigate cloud cost spikes.
Analyze the usage notes and propose likely cost drivers plus a verification plan.
Input:
Usage notes: #notes#
Billing symptoms: #text#
Constraints:
- Do not assume pricing details.
- Identify measurable checks.
- Include quick containment steps.
Output:
1. Likely drivers
2. Data to inspect
3. Containment actions
4. Longer-term optimizations
5. Alerting suggestions