private createDurationMonitor()

in src/lambda.ts [123:135]

• 13 lines of code
• 1 McCabe index (conditional complexity)

  private createDurationMonitor(timeoutSec: number, durationPercentThreshold: number = DEFAULT_DURATION_THRESHOLD_PERCENT) {
    const fn = this.fn;
    const durationMetric = this.metrics.metricDuration(fn.functionName).p99;
    const durationThresholdSec = Math.floor(durationPercentThreshold / 100 * timeoutSec);
    const durationAlarm = durationMetric.createAlarm(this, 'DurationAlarm', {
      alarmDescription: `p99 latency >= ${durationThresholdSec}s (${durationPercentThreshold}%)`,
      comparisonOperator: cloudwatch.ComparisonOperator.GREATER_THAN_THRESHOLD,
      threshold: durationThresholdSec * 1000, // milliseconds
      evaluationPeriods: 3,
    });
    this.watchful.addAlarm(durationAlarm);
    return { durationMetric, durationAlarm };
  }