Amazon Web Service

CloudWatch

Have you ever thought, how you are going to monitor your AWS resources? You do not need to set up your own monitoring system and go through the pain of managing, scaling the monitoring system and infrastructure. Amazon CloudWatch is a monitoring system that can do all your work without getting you into any kind complexities. It is reliable, flexible and easy to use.


Using Amazon CloudWatch, you can monitor your AWS resources in real time. Using CloudWatch you can collect metrics and track your resource by using the metrics that were collected previously. You can define rules that will make changes to your AWS resources or you'll recieve notification by AWS based on the changes to be done. Some of the metrics you can monitor is CPU usages of your EC2 machine. You can lauch new EC2 machine when CPU usage goes above saturation mark. You can choose metrics from available predefined metrics. Custom metrics can also be created.


Terminologies


Namespaces

You must specify the namespace while creating a metric. Only XML character is allowed for defining the namespace and it can not exceed 256 characters. The namespace provides isolation for metrics that belongs to different Namespaces.


Metrics

In simple term, metrics consists of a time series data of specific resources. For example, CPU usage of an EC2 machine over a period of time is a metrics. It is also called data points.


When a metrics is defined then AWS service send defined metrics to CloudWatch. Metrics are region specific and can be deleted. The retention period is 15 months after which it gets deleted automatically if no data published.


Dimension

Metric is uniquely identify using name/value pair that is known as Dimension. A metric can have maximum 10 dimensions.

Statistics

Metrics are the data collected over a specific period of time. These data are aggregated and called statistics. You can have minimum, maximum, sum, average, SampleCount and pNN.MM statistics. All these statistics serves the different purpose.


Percentile

Dataset relevant standing of value is indicated by Percentile.


Alarms

The alarm is used to get automatic notifications.



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