How would you implement a simple healthcheck endpoint for a microservice to be used by liveness/readiness probes?

How would you implement a simple healthcheck endpoint for a microservice to be used by liveness/readiness probes?

• A. Use a heavy internal check that runs every hour.
• B. Return 500 for non-200 conditions only during peak load.
• C. Configure a third-party health service to monitor the app.
• D. Provide a lightweight HTTP endpoint that returns 200 when healthy; configure readiness and liveness probes to call that endpoint with appropriate timing.

Answer: (D)