DescribeAlarmContributors

Source: src/AWS/CloudWatch/DescribeAlarmContributors.ts

Runtime binding for cloudwatch:DescribeAlarmContributors — list the time-series contributors currently in ALARM for a contributor-enabled metric-math alarm. Bind it to the Alarm; the alarm name is injected automatically.

Provide CloudWatch.DescribeAlarmContributorsHttp on the hosting Lambda Function to satisfy the requirement.

Reading Alarm State

// init — grants cloudwatch:DescribeAlarmContributors on the alarm
const describeAlarmContributors =
  yield* AWS.CloudWatch.DescribeAlarmContributors(alarm);

// runtime — plain metric alarms have no contributor data; the typed
// errors let you treat that as an empty result
const contributors = yield* describeAlarmContributors().pipe(
  Effect.map((r) => r.AlarmContributors ?? []),
  Effect.catchTag(
    ["ResourceNotFoundException", "ValidationException"],
    () => Effect.succeed([]),
  ),
);