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Amazon CloudWatch

What it is

Amazon CloudWatch is AWS's managed observability service for metrics, logs, and alarms across AWS services and customer applications. Most AWS services auto-publish default metrics (CPU, IOPS, network bytes, per-service-specific counters) to CloudWatch at no additional charge; opt-in tiers (higher-resolution metrics, Logs ingestion, custom dashboards, cross-account / cross-region aggregation) are billed separately.

Stub — expand as dedicated CloudWatch-internals sources are ingested.

Seen in

  • sources/2024-02-15-planetscale-amazon-aurora-pricing-surprising-costs — canonical wiki disclosure of CloudWatch's three-tier billing model for Amazon Aurora monitoring:
    1. Default Aurora metrics — "Amazon Aurora will send a wide array of metrics to CloudWatch every minute for both the cluster and each individual instance at no extra cost."
    2. Enhanced Monitoring — "uses CloudWatch Logs, which are charged based on how much data is sent into CloudWatch each month. Associated costs may differ drastically between clusters, but you do get more granular data to analyze as needed."
    3. Performance Insights — "bills based on how long you wish to retain the data, up to two years. The first seven days are included at no additional cost, but you will be billed for any data retention beyond that." First canonical wiki instance of CloudWatch's three-tier DB-monitoring billing surface. Morrison's framing: CloudWatch is an "external tool" requiring context-switch from the DB console — vs PlanetScale's in-dashboard Insights product which bundles query-level observability directly.
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