如何通过 aws-cdk 向 AWS Lambda 函数添​​加自定义指标和警报

Question

我有点坚持配置cdk一个常见用例：为Lambda 函数设置警报和指标

import lambda = require("@aws-cdk/aws-lambda")
import { Duration } from "@aws-cdk/core"
import lambda = require("@aws-cdk/aws-lambda")
import { Duration } from "@aws-cdk/core";
import { LogGroup } from '@aws-cdk/aws-logs'
import { MetricFilter, FilterPattern } from '@aws-cdk/aws-logs'
import { Alarm, ComparisonOperator, TreatMissingData } from "@aws-cdk/aws-cloudwatch"

const lambdaFn = new lambda.Function(this, "VouchersPayoutQueueConsumer", {
    functionName: 'lambda-custom-name',
    runtime: lambda.Runtime.NODEJS_10_X,
    code: lambda.Code.fromAsset("dir_name"),
    timeout: Duration.seconds(15),
    memorySize: 1024,
    handler: "handler.handlerMethod",
})

const METRIC_NAME = 'metric-name'
const METRIC_NAMESPACE = 'metric-namespace'

new MetricFilter(this, `MetricFilterId`, {
    metricName: METRIC_NAME,
    metricNamespace: METRIC_NAMESPACE,
    logGroup: LogGroup.fromLogGroupName(this, "LambdaLogGroupId", `/aws/lambda/${lambdaFn.functionName}`),
    filterPattern: FilterPattern.stringValue("$.params.name", "==", "ReportErrorsToS3"),
    metricValue: "$.params.value"
})

new Alarm(this, "AlarmId", {
    metric,
    evaluationPeriods: 1,
    actionsEnabled: true,
    alarmName: `alarms-s3errors`,
    alarmDescription: "Alarm ReportErrorsToS3",
    comparisonOperator: ComparisonOperator.GREATER_THAN_THRESHOLD,
    treatMissingData: TreatMissingData.IGNORE,
    period: Duration.hours(1),
    threshold: 1,
    statistic: "max"
})

1. 从哪里获取指标以及如何使用MetricFilter映射它？
2. 如何正确设置logGroup为MetricFilter来解决这一问题：

   1/4 | 上午 11:02:05 | CREATE_FAILED | AWS::Logs::MetricFilter | MetricFilter (MetricFilter8E0FEF2B) 指定的日志组不存在。（服务：AWSLogs；状态代码：400；错误代码：ResourceNotFoundException；请求 ID：a1395551-5768-40c3-baaa-cbb133effe7b）

AWS CDK AWS 1.22.0

Answer 1

• 该指标是单独声明的，但metricName和命名空间 必须与MetricFilter使用的相同
• LogGroup也必须单独实例化，但logGroupName与 lambda 将创建的相同。
  • 提示性讨论 - lambda 函数的日志组配置

结果：

import { Metric } from "@aws-cdk/aws-cloudwatch";
import lambda = require("@aws-cdk/aws-lambda")
import { Duration } from "@aws-cdk/core";
import { LogGroup } from '@aws-cdk/aws-logs'
import { MetricFilter, FilterPattern } from '@aws-cdk/aws-logs'
import { Alarm, ComparisonOperator, TreatMissingData } from "@aws-cdk/aws-cloudwatch"

const LAMBDA_CUSTOM_NAME = `lambda-custom-name`

let logGroup = new LogGroup(this, 'LogGroup', {
  logGroupName: `/aws/lambda/${LAMBDA_CUSTOM_NAME}`
})

const lambdaFn = new lambda.Function(this, "VouchersPayoutQueueConsumer", {
    functionName: LAMBDA_CUSTOM_NAME,
    runtime: lambda.Runtime.NODEJS_10_X,
    code: lambda.Code.fromAsset("dir_name"),
    timeout: Duration.seconds(15),
    memorySize: 1024,
    handler: "handler.handlerMethod",
});


const METRIC_NAME = 'metric-name'
const METRIC_NAMESPACE = 'metric-namespace'

const metric = new Metric({
    namespace: METRIC_NAMESPACE,
    metricName: METRIC_NAME
})

new MetricFilter(this, `MetricFilterId`, {
    metricName: METRIC_NAME,
    metricNamespace: METRIC_NAMESPACE,
    logGroup: logGroup,
    filterPattern: FilterPattern.stringValue("$.params.name", "==", "ReportErrorsToS3"),
    metricValue: "$.params.value"
})

new Alarm(this, "AlarmId", {
    metric,
    evaluationPeriods: 1,
    actionsEnabled: true,
    alarmName: `alarms-s3errors`,
    alarmDescription: "Alarm ReportErrorsToS3",
    comparisonOperator: ComparisonOperator.GREATER_THAN_THRESHOLD,
    treatMissingData: TreatMissingData.IGNORE,
    period: Duration.hours(1),
    threshold: 1,
    statistic: "max"
})