aether

AETHER

A open telemetry exporter to calculate the carbon emissions generated by your cloud infrastructure

Contributing

Please see our contributing guide

Architecture Overview

Explanations

• Coefficient Interface: The coefficent used to calculate the CO2e of various resources
• Source: Where to get the current resource utilization and number of resources
• Calculator: Using the above inputs to calulate the current CO2e
• HTTP Server: exposes the metrics in various formats

Config file

Aether supports passing the various configurations via a config file.

Location

The config file will be loaded from the following locations and in the following order:

1. the working directory
2. a sub-directory: ./conf

Name

The name of the file is by default: local.yaml
This helps with testing out the software locally.
The name of the config file can be changed by setting the following environment variable:

AETHER_CONFIG=aether

In the example above the new config file name will be: aether.yaml

Example

# Defines the address and port the aether api listens to
api:
  # The address the API server should listen to
  # Can be overridden via: AETHER_API_ADDRESS=localhost
  # Default: 127.0.0.1
  address: 127.0.0.1

  # The port the API server should listen to
  # Can be overridden via: AETHER_API_PORT=8181
  # Default: 8080
  port: 8080

# Aether can use a proxy if necessary
# IMPORTANT: if set, the proxy configuration is applied to all providers
proxy:
  # Can be overridden via: AETHER_PROXY_HTTP_PROXY=http://localhost:3128
  httpProxy: 'http://squid:3128'

  # Can be overridden via: AETHER_PROXY_HTTPS_PROXY=https://localhost:3128
  httpsProxy: 'https://squid:3128'

  # Can be overridden via: AETHER_PROXY_NO_PROXY=localhost
  noProxy: 'intranet.example.com'

# Aether support pulling data from multiple providers
# Each provider has a set of configurations
providers:
  # AWS Provider  
  aws:
    # List of regions to read the cloud watch metrics for
    regions:
      - us-east-2
      - us-west-1

    # A namespace is a container for CloudWatch metrics. 
    # Metrics in different namespaces are isolated from each other, 
    # so that metrics from different applications are not mistakenly aggregated into the same statistics.
    # https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/aws-services-cloudwatch-metrics.html
    namespaces:
      - 'AWS/EC2' # EC2
      - 'ContainerInsights' # EKS

    # If the credentials config is empty then, aether will try use the aws sdk default 
    # credentials chain:
    # 
    # 1. Environment variables.
    #    a. Static Credentials (AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN)
    #    b. Web Identity Token (AWS_WEB_IDENTITY_TOKEN_FILE)
    # 2. Shared configuration files.
    #    a. SDK defaults to credentials file under .aws folder that is placed in the home folder
    #       on the computer.
    #    b. SDK defaults to config file under .aws folder that is placed in the home folder 
    #       on the computer.
    # 3. If your application uses an ECS task definition or RunTask API operation, 
    #    IAM role for tasks.
    # 4. If your application is running on an Amazon EC2 instance, IAM role for Amazon EC2.

    # Otherwise you can specify one or more locations where to look for either the credentials 
    # or the config or both    
    credentials:
      # Load the credentials for the specific profile, if not set it uses the [default] profile. 
      # Example:
      # [default]
      # aws_access_key_id = <YOUR_ACCESS_KEY_ID>
      # aws_secret_access_key = <YOUR_SECRET_ACCESS_KEY>      
      #
      profile: 'profile_name'
      filePaths: 
        - 'full_credentials_file_path'
      
    config:
      # Load the config for the specific profile, if not set it uses the [default] profile.
      # Example:
      # [default]
      # region = <REGION>
      profile: 'profile_name'
      filePaths:
        - 'full_file_path'

    # Allows to configure various TCP parameters for the connection to the AWS API
    transport:
      # This setting represents the maximum amount of time to keep an idle network connection 
      # alive between HTTP requests.
      # Set to 0 for no limit.
      # See https://golang.org/pkg/net/http/#Transport.IdleConnTimeout
      # Valid time units are: "ms", "s", "m"
      #
      # Default is zero
      idleConnTimeout: 5s

      # This setting represents the maximum number of idle (keep-alive) connections across all hosts.
      # One use case for increasing this value is when you are seeing many connections in a 
      # short period from the same clients
      # 0 means no limit.
      # See https://golang.org/pkg/net/http/#Transport.MaxIdleConns
      # Default is zero
      maxIdleConns: 0

      # This setting represents the maximum number of idle (keep-alive) connections
      # to keep per-host.
      # One use case for increasing this value is when you are seeing many connections
      # in a short period from the same clients
      #
      # Default is two idle connections per host.
      #
      # Set to 0 to use DefaultMaxIdleConnsPerHost (2).
      #
      # See https://golang.org/pkg/net/http/#Transport.MaxIdleConnsPerHost
      # Default is zero
      maxIdleConnsPerHost: 0

      # This setting represents the maximum amount of time to wait for a client to
      # read the response header.
      # If the client isn’t able to read the response’s header within this duration,
      # the request fails with a timeout error.
      # Be careful setting this value when using long-running Lambda functions,
      # as the operation does not return any response headers until the Lambda
      # function has finished or timed out.
      # However, you can still use this option with the ** InvokeAsync** API operation.
      #
      # Default is no timeout; wait forever.
      # 
      # See https://golang.org/pkg/net/http/#Transport.ResponseHeaderTimeout
      # Valid time units are: "ms", "s", "m"
      # Default is zero
      responseHeaderTimeout: 10s

      # This setting represents the maximum amount of time waiting for a
      # TLS handshake to be completed.
      #
      # Zero means no timeout.
      #
      # See https://golang.org/pkg/net/http/#Transport.TLSHandshakeTimeout
      # Valid time units are: "ms", "s", "m"
      # Default is 10 seconds.
      tlsHandshakeTimeout: 10s

Development

To get direction on how to develop on Aether please see the Development Guide