Idea: Support Endpoint

[eaglerainbow]

Summary / Problem Statement

Provide a new endpoint, let's say /support. It must be protected by some sort of password. Once triggered, the response shall be a JSON document, which contains all kind of interesting values/attributes, which could help tracking down issues. For instance:

• Various metric values from the InternalMetrics.
• The number of CFCC call made
• The latency the different CFCCs generate
• The cache hit rate (if running on Caffeine)
• The last 10 log statements of level "WARN" or higher
• The number of apps defined in config
• The number of targets defined in config
• The number of resolvedTargets determined
• The timestamp when it was created
• The version of Promregator
• The heap memory currently occupied
• ...

Could also be implemented with an indirection: We could register several "support context providers" (defined via an interface), which can be registered during runtime.

The format shall be kept private and dynamic.

Keep it lean, though: We don't want to write an ITSAM framework here...