Execute the following runbook for service 'api-server':
1. Analyze both errors and warnings for the last 24 hours, compare that with the previous 3 days (i.e. from 4 days ago to 1 day ago), do you see any new issues emerging?
2. For any new issue identified (pick the top 5 if many), find the potential root cause by
a. Querying sample traces if available
b. Examining any recent code or config changes made to the relevant files
3. Generate a report by deep diving into each new issue. The report should cover:
a. Severity
b. Number of occurrences
c. Example error message or trace
d. Impact analysis
e. Potential root cause
f. Related PRs if any
g. Recommended next steps