KrakenD EE v2.8 released: Configurable logging, Redis-backed rate limits, Lua, YAML encoding and more

We are excited to announce the release of KrakenD Enterprise 2.8, packed with new features, upgrades, bug fixes, and some deprecations. Below is a breakdown of the updates.

Configurable access logs

The most acclaimed feature by our customers was the ability to customize the access log. This is why we have introduced in the new version a custom log format that allows you to define the string and fields you want to print in the stdlog. For instance, you can define an access_log_custom_format like this:

%{time} | %{statusCode} | %{latencyMs} | %{clientIP} | %{method} %{path} %{jwt.sub}\n

By defining the pattern, you can design exactly what the log will look like.

Redis rate limits

KrakenD is a stateless software. However, there are a few times when customers need a stateful option regarding rate limiting. In addition to our existing behavior, we have added a stateful option backed in Redis to all our rate limits, including:

• Service-level rate limits
• Endpoint-level rate limits
• Tiered rate limits

To simplify its monitoring, we have also added a Grafana Redis pool monitoring dashboard to improve visibility and diagnostics.

Lua enhancements

The new Lua Advanced Helpers bring powerful JSON, CSV, YAML, XML, time, base64, and hashing tools. These are implemented natively in Go for better performance. You can read a response string without needing external Lua source files and parse it as a JSON response with a single line. For instance:

local res = response.load()
local report = json.unmarshal(res:data():get("content"))

In addition, there are more upgrades to existing functions:

• The custom_error function supports a third parameter for specifying the content type.
• The headers(header,value) setter accepts now a nil value to destroy headers.
• The error log includes now a decorator showing the line and file where the error occurred.
• A new method, keyExists, is available as a helper for luaTable types.

API design enhancements

Finally, there are a few enhancements worth mentioning in this version that help in the API design and documentation phases:

• OpenAPI got better: The OpenAPI specification generation is now more powerful with richer customization options. When generating the docs, you can enrich a lot more the explanations about parameters, headers, and query strings, like adding enum, hide, or type options.
• Enhanced Postman collections: When generating collections, you can now group endpoints in folders and add descriptions to these folders.
• YAML Encoding Support: Because YAML is so extended that things like converting API responses into YAML files are a thing, we have added support both to read YAML encoding and converting content in YAML format (e.g., JSON to YAML), regardless of the original source.
• Moesif metadata: The Moesif integration now supports sending custom metadata with events.

With these updates and other improvements, such as the new gRPC introspection support or OpenTelemetry overrides, KrakenD Enterprise 2.8 aims to provide better control, performance, and developer experience. Dive into the documentation to explore these features further!