Operational Plugin: Health check

[gcotelli]

One of the operational plugins (#41) .

• Endpoint /operations/health-check
• Must be possible to configure this plugin with additional checks to be run.
• In case there are multiple checks the general status will be the worst status of the check runs and every check status can be accessed asking for the details media type and looking at the details object.
• A POST operation with the summary media type can be requested without Authorization, the rest requires an authenticated request with the proper authorization credentials.

Supported operations:

• Run a health check and report the status: POST - application/vnd.stargate.health-check.summary+json
• Run a health check and report a detailed status: POST - application/vnd.stargate.health-check.details+json

Supported statuses

Status Keyword	HTTP Status Code	Description
PASS	200 OK	The service is fully operational
WARN	200 OK	The service is responding but with degraded performance
FAIL	503 Service Unavailable	The service endpoints are not responding reliably

[gcotelli]

Review https://inadarei.github.io/rfc-healthcheck/

[gcotelli]

Fixed in #60