The Hermes V2 update introduces a series of enhancements focusing on logging, communication with Graphite, and error handling.

BREAKING CHANGES

Additional Endpoints

Hermes V2 extends its integration with Graphite through additional API endpoints, enhancing its capability to manage data flow and interactions more effectively:

PATCH /profile/{publicId}: Updates specific profile details.
POST /changes/acknowledgement: Acknowledges changes received from Graphite.
GET /changes/connections: Retrieves information about current connections.
POST /adapter/passthrough/{interface}: Enables log passthrough from Hermes to Graphite
POST /adapter/long-poll/{interface}: Initiates long-polling on an interface to get near real-time integration requests

Logging Configuration

Array Configuration: The logging setup now requires an array of logger objects, allowing for the creation of logs to various outputs, such as file-based and stdout logging, tailored to specific needs.
Logger Object Schema:

{
  "level": "debug | info | warn | error",
  "outputPath": "path/to/your/log/file.log | stdout",
  "jsonLogging": true | false
}

Example Configuration: Below is an example showcasing a setup for detailed debugging in JSON format, output to both a file and the standard output.

{
  "logging": [  
    {  
      "level": "debug",  
      "outputPath": "path/to/your/log/file.log",  
      "jsonLogging": true  
    },  
    {  
      "level": "debug",  
      "outputPath": "stdout",  
      "jsonLogging": true  
    }  
  ]
}

Enhancements

Logging

Flexibility & Granularity: Transitioned from Zap to log/slog for enhanced flexibility. Configurations now offer finer control over log generation, including verbosity and format.
Passthrough Logging: Newly introduced capability to send logs periodically to a remote server for centralized monitoring.

Communication Improvements

Dedicated Endpoints: Improved communication flow by calling dedicated endpoints, allowing for more precise control over message timing.
Log Transmission: An endpoint dedicated to log transmission has been added, allowing for future enhancements to view the current integration status directly in the user interface.
Exponential Backoff: Implements a backoff strategy for retryable errors (408, 429, 500, 502, 503, 504), significantly reducing errors due to downtime or internal server errors.

Error Handling

Robustness: Enhanced error recovery mechanisms, including adapter restart capabilities upon failure.
Crash Logging: Introduces unique crash logs for unrecoverable errors.
Improved Error Feedback: Enhanced error messaging for issues like database timeouts, ensuring clearer communication back to Graphite.

Testing Suite

Comprehensive Testing: A new testing suite designed to test adapter functionalities, ensuring reliability and performance as we continue to make improvements to the adapter.

This release aims to address key areas of improvement identified in previous versions, providing a more robust, efficient, and user-friendly experience.

Installation

wget https://storage.googleapis.com/graphite-hermes/develop/latest/hermes-go.linux.zip

unzip hermes-go.linux.zip

cd hermes

chmod +x hermes && ./hermes --version

Before running the Hermes application, ensure your configuration is updated according to the logging breaking changes above.

Changelog

Answer Metadata Update

Hermes Version 2 Release

September 2023 Release