Grafana DynamoDB CloudWatch Dashboard

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本文缩写（英文全称与中文含义）

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Row	CloudWatch Metrics	Statistic	Display
Overview	`ThrottledRequests`	Sum	stat and trend by table
Overview	`SuccessfulRequestLatency`	p95 / p99	latency by operation
Overview	`SystemErrors`, `UserErrors`	Sum	error count
Overview	`ConsumedReadCapacityUnits`, `ConsumedWriteCapacityUnits`	Sum	capacity usage
Drilldown	`ReadThrottleEvents`, `WriteThrottleEvents`	Sum	read/write throttle split
Drilldown	`ConditionalCheckFailedRequests`	Sum	conditional write conflict
Capacity	consumed vs provisioned RCU/WCU	metric math	capacity pressure
Debug	`ReturnedItemCount`, `ReturnedBytes`	Sum	query result size

DynamoDB 首屏优先看 throttle、latency、errors 与 capacity；TTL、Stream、Global Table 等问题进入相应专项视图。

DynamoDB dashboard 要按 table、operation、GSI 过滤。
Throttle 和 latency 是 overview 必放项。
TTL、stream、global table、backfill 不默认放第一屏。