Q: What is the difference between CloudWatch Logs, CloudWatch Metrics, and CloudWatch Alarms?
- CloudWatch Logs — stores raw log data (text). Your app, Lambda, ECS, VPC Flow Logs all write here. You can search/query with CloudWatch...
#AWS #Monitoring & CloudWatch #L2 #Cloud #Infrastructure #EC2
🎙️ Candidate Opening & Architectural Context
""In our AWS cloud environment, we managed high-traffic microservices where this exact scenario occurred. When addressing this question, I walk the interviewer through our production incident runbook: isolating the blast radius, checking diagnostic logs and metrics, and applying a safe fix.""
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🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Initial Diagnostics & Root Cause Analysis
The flow: App → writes logs to CloudWatch Logs → Metric Filter extracts numbers → custom CloudWatch Metric → Alarm watches metric → SNS notification sent.
- CloudWatch Logs — stores raw log data (text). Your app, Lambda, ECS, VPC Flow Logs all write here. You can search/query with CloudWatch Logs Insights.
- CloudWatch Metrics — numeric time-series data. CPU%, request count, latency, error rate. Built-in for AWS services; custom metrics from your app via the CloudWatch SDK/API.
- CloudWatch Alarms — watches a metric and triggers an action when a threshold is breached. Actions: SNS notification, Auto Scaling policy, EC2 action (stop/reboot).
2️⃣
Remediation & Permanent Safeguards
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: CloudWatch Logs — stores raw log data (text). Your app, Lambda, ECS, VPC Flow Logs all write here. You can search/query with Cloud."
⚡ 60-Second Elevator Pitch Talking Points
- CloudWatch Logs — stores raw log data (text). Your app, Lambda, ECS, VPC Flow Logs all write here...
- CloudWatch Metrics — numeric time-series data. CPU%, request count, latency, error rate. Built-in...
- CloudWatch Alarms — watches a metric and triggers an action when a threshold is breached. Actions...
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