Add backend ID when exposing circuitid with HiddenServiceExportCircuitID
Currently Tor can expose a circuitid to backends with directive HiddenServiceExportCircuitID using the HAProxy proxy protocol, but because there could be multiple Tor instances accessing the same backend (e.g. onionbalance) circuitids could collide.
I propose a config directive HiddenServiceExposeInstanceID, which enables users to specify a tor instance ID which can be placed instead of dead:beef:4dad.
If this seems ok, I’ll whip up a simple patch.
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