What are CloudWatch metrics?
What are CloudWatch metrics?
Metrics. Metrics are the fundamental concept in CloudWatch. A metric represents a time-ordered set of data points that are published to CloudWatch. Think of a metric as a variable to monitor, and the data points as representing the values of that variable over time.
What Amazon CloudWatch metrics are available?
AWS Elastic Load Balancing (ELB) CloudWatch Metrics. AWS Lambda CloudWatch Metrics. AWS Relational Database Service (RDS) CloudWatch Metrics. AWS Simple Storage Service (S3) CloudWatch Metrics.
What are the three states of a CloudWatch alarm?
A CloudWatch Alarm is always in one of three states: OK, ALARM, or INSUFFICIENT_DATA.
What metrics can be monitored through CloudWatch for free?
You can monitor all the CPU load, disk I/O, and network I/O metrics such as avg CPU utilization, avg disk reads, avg disk writes, max network in, and max network out without additional charges.
How are CloudWatch metrics calculated?
In CloudWatch terms: Returns the rate of change of the metric, per second. This is calculated as the difference between the latest data point value and the previous data point value, divided by the time difference in seconds between the two values.
How do I get CloudWatch metrics?
Open the CloudWatch console at https://console.aws.amazon.com/cloudwatch/ .
- In the navigation pane, choose Metrics.
- Select a metric namespace (for example, EC2).
- Select a metric dimension (for example, Per-Instance Metrics).
- The All metrics tab displays all metrics for that dimension in the namespace.
What are the default CloudWatch metrics?
First, by default CloudWatch uses basic monitoring, which only publishes metrics at five-minute intervals. You can enable detailed monitoring when available to increase that resolution to one minute, at additional cost. Second, some metrics have nuances specific to EC2 instances, which we will cover below.
How do I read CloudWatch metrics?
To view available metrics by category (console) Open the CloudWatch console at https://console.aws.amazon.com/cloudwatch/ . In the navigation pane, choose Metrics. Choose the EC2 metric namespace. Select a metric dimension (for example, Per-Instance Metrics).
How long do CloudWatch metrics last?
15 days
CloudWatch retains metric data as follows: Data points with a period of less than 60 seconds are available for 3 hours. These data points are high-resolution custom metrics. Data points with a period of 60 seconds (1 minute) are available for 15 days.
Which of the following requires a custom CloudWatch metric to monitor?
The correct answer is option A (Memory Utilization of an EC2 instance).
What are dimensions in CloudWatch metrics?
A dimension is a name/value pair that is part of the identity of a metric. You can assign up to 10 dimensions to a metric. Because dimensions are part of the unique identifier for a metric, whenever you add a unique name/value pair to one of your metrics, you are creating a new variation of that metric.
How do you make custom CloudWatch metrics?
Push custom metrics using the CloudWatch agent
- Install the CloudWatch unified agent.
- Assign a role or credentials to the instance with CloudWatch permissions.
- Create the CloudWatch agent configuration file.
- Start the agent.
What are metrics and data points in CloudWatch?
Think of a metric as a variable to monitor, and the data points as representing the values of that variable over time. You can use these metrics to verify that your system is performing as expected. Amazon EC2 Auto Scaling publishes data points to CloudWatch about your Auto Scaling groups.
How do I enable auto scaling group metrics for CloudWatch?
When you enable Auto Scaling group metrics, your Auto Scaling group sends sampled data to CloudWatch every minute. There is no charge for enabling these metrics. Open the Amazon EC2 Auto Scaling console at https://console.aws.amazon.com/ec2autoscaling/ . Select the check box next to your Auto Scaling group.
How do CloudWatch alarms check metrics based on time stamps?
CloudWatch alarms check metrics based on the current time in UTC. Custom metrics sent to CloudWatch with time stamps other than the current UTC time can cause alarms to display the Insufficient Data state or result in delayed alarms. CloudWatch retains metric data as follows:
How does CloudWatch aggregate data across multiple dimensions?
For metrics produced by certain AWS services, such as Amazon EC2, CloudWatch can aggregate data across dimensions. For example, if you search for metrics in the AWS/EC2 namespace but do not specify any dimensions, CloudWatch aggregates all data for the specified metric to create the statistic that you requested.
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