CloudWatch is a global service provided by AWS. CloudWatch monitors resources such as EC2 instances, RDS databases, Lambda functions and applications running within AWS also with CloudWatch dashboard allows you to visualize its performance and operations across multiple regions. With CloudWatch you're able to support cross-account access, monitor applications.
CloudWatch captures varieties of operational data within your resources.
Metrics- Examples of metrics would be CPU utilization, disk usage, Network traffic.
Logs- CloudWatch captures log and stores the logs from AWS resources applications like Lambda function, Elastic Beanstalk.
Alarms- You can set-up an alarm on the metrics created as well as logs and CloudWatch will send you SNS notification once it breached its threshold.
Dashboards- This displays customized views of metrics and logs which CloudWatch monitors.
CLOUDWATCH AGENT
CloudWatch agent is a software application that can be installed in your server. The agent can support on-premises or in the cloud, and it can be configured to collect logs within applications like NGINX, MYSQL, DOCKER, APACHE.
HOW CLOUD WATCH AGENT WORKS IN CI/CD.
Install the agent package manager YUM or APT.
Configure the agent using Ansible, Chef, Puppet
Integrate the CloudWatch agent into your CI/CD pipeline by adding it to the build deployment script or post-build.
The CloudWatch agent collects metrics and logs because it has been configured. It can also collect latency requests and error rates aside from application logs.
Referencing : AWS documentation
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