[Bug]: Implement Concurrent Health Checks for gateways instead of sequential.

[kevalmahajan]

🐞 Bug Summary

The current implementation of check_health_of_gateways() performs health checks sequentially, causing total execution time to scale linearly with the number of gateways (O(n·t)). This results in significant delays when many gateways are registered.

A proposed optimization introduces concurrent health checks using asyncio.gather() and a new helper method _check_single_gateway_health(), but this behavior is not yet implemented and needs to be added.

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🧩 Affected Component

Select the area of the project impacted:

• mcpgateway - API
• mcpgateway - UI (admin panel)
• mcpgateway.wrapper - stdio wrapper
• Federation or Transports
• CLI, Makefiles, or shell scripts
• Container setup (Docker/Podman/Compose)
• Other (explain below)

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🔁 Steps to Reproduce

1. Register multiple gateways (e.g., 20–50).
2. Trigger a full health check via check_health_of_gateways().
3. Observe that each gateway health check runs sequentially.
4. Total time increases proportionally with number of gateways.

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🤔 Expected Behavior

Health checks should run in parallel, not sequentially.
check_health_of_gateways() should use asyncio.gather() to check all gateways concurrently.
Total execution time should drop from O(n·t) to O(t), where:

• n = number of gateways
• t = time to check one gateway

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🧠 Environment Info

You can retrieve most of this from the /version endpoint.

Key	Value
Version or commit	e.g. v0.9.0 or main@a1b2c3d
Runtime	e.g. Python 3.11, Gunicorn
Platform / OS	e.g. Ubuntu 22.04, macOS
Container	e.g. Docker, Podman, none