Release 1.3.0

[armando-rodriguez-cko]

Add Request Telemetry for Go SDK (#133, #134)

Key Updates

1. Telemetry Implementation:

   • Request telemetry is now enabled by default in the Go SDK.
   • Monitors request latency, improving observability and allowing continuous performance improvements.
   • Added a configuration option to disable telemetry:

     api := checkout.Builder().
         Previous().
         WithSecretKey("CHECKOUT_PREVIOUS_SECRET_KEY").
         WithEnvironment(configuration.Sandbox()).
         WithEnableTelemetry(false).
         Build()

2. Configuration and Client Enhancements:

   • The Configuration struct includes a EnableTelemetry flag.
   • The ApiClient was updated to handle telemetry logic, such as injecting metrics into the cko-sdk-telemetry HTTP header.

3. New Telemetry Header:

   • Introduced the cko-sdk-telemetry HTTP header to include telemetry data for requests.
   • Populates the header with the last request's ID and duration from the telemetry queue.

4. Telemetry Queue:

   • A new telemetry queue tracks the last 10 request metrics.
   • Metrics include:
     • PrevRequestId
     • RequestId
     • PrevRequestDuration (in milliseconds)

5. Testing:

   • Unit and integration tests added to verify:
     • Telemetry headers are sent by default.
     • Telemetry is not sent when explicitly disabled.
     • Concurrency handling for the telemetry queue.
     • Bottleneck scenarios where request delays simulate real-world latency.

6. Documentation:

   • A new section in README.md describes telemetry functionality and usage:

     ## Telemetry
     Request telemetry is enabled by default in the Go SDK. Request latency is included in the telemetry data. Recording the request latency allows Checkout.com to continuously monitor and improve the merchant experience.