Feature request: Run a script when upstream detected down/up

[Cliff Wells]

On Mon, 2008-04-28 at 08:44 -0700, Rt Ibmer wrote:
> I am using Amazon EC2 with nginx primarily for load balancing and
> proxying requests using proxy_pass.  In this EC2 environment upstream
> servers can fail without warning.
> 
> It would be a fantastic edition to nginx to have it run a backend
> shell script when it detects that it needs to skip over an upstream
> server because it is not responding in accordance with
> proxy_next_upstream.

This sounds like a job for a heartbeat monitor, not a web server.  What
happens if you decide to restart the backend process on one of your
upstream servers?  Would you still want your script run?

Regards,
Cliff