cwl-metrics.yaml

Mappings:
  CWLogs:
    WebRequestLogGroup:
      TimestampFormat: "%Y-%m-%dT%H:%M:%S.%f%z"


Outputs:
  WebRequestCWLogGroup:
    Description: "The name of the Cloudwatch Logs Log Group created for this environments web server access logs. You can specify this by setting the value for the environment variable: WebRequestCWLogGroup. Please note: if you update this value, then you will need to go and clear out the old cloudwatch logs group and delete it through Cloudwatch Logs."
    Value: { "Ref" : "AWSEBCloudWatchLogsAppLogGroup"}


Resources :
  AWSEBCloudWatchLogsAppLogGroup:
    Type: "AWS::Logs::LogGroup"
    DependsOn: AWSEBBeanstalkMetadata
    DeletionPolicy: Retain
    Properties:
      LogGroupName:
        "Fn::GetOptionSetting":
          Namespace: "aws:elasticbeanstalk:application:environment"
          OptionName: WebRequestCWLogGroup
          DefaultValue: {"Fn::Join":["-", [{ "Ref":"AWSEBEnvironmentName" }, "logs"]]}
      RetentionInDays: 14

  AWSEBAutoScalingGroup:
    Metadata:
      "AWS::CloudFormation::Init":
        CWLogsAgentConfigSetup:
          files:
            "/tmp/cwlogs/conf.d/tomcat-catalina.conf":
              content : |
                [web_log]
                file = /var/log/web-1.log
                log_group_name = `{ "Ref" : "AWSEBCloudWatchLogsAppLogGroup" }`
                log_stream_name = web
                datetime_format = `{"Fn::FindInMap":["CWLogs", "WebRequestLogGroup", "TimestampFormat"]}`
                [web_error_log]
                file = /var/log/web-1.error.log
                log_group_name = `{ "Ref" : "AWSEBCloudWatchLogsAppLogGroup" }`
                log_stream_name = web-error
                datetime_format = `{"Fn::FindInMap":["CWLogs", "WebRequestLogGroup", "TimestampFormat"]}`

              mode  : "000400"
              owner : root
              group : root
              
              
  AWSEBCWLGreetingHitsMetricFilter :
    Type : "AWS::Logs::MetricFilter"
    Properties :
      LogGroupName: { "Ref" : "AWSEBCloudWatchLogsAppLogGroup" }
      FilterPattern : '{ $.fields_requested_uri = "/greeting"}'
      MetricTransformations :
        - MetricValue : 1
          MetricNamespace: {"Fn::Join":["/", ["elastic-beanstalk", {"Ref":"AWSEBEnvironmentName"}]]}
          MetricName : greeting-hits