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
Troubleshooting DNS resolution issues often requires additional information. This PR expands the effect of the TS_DEBUG_DNS_FORWARD_SEND envknob to forwarder.forwardWithDestChan, and includes the request type, domain name length, and the first 3 bytes of the domain's SHA-256 hash in the output. Fixes #13070 Signed-off-by: Nick Khyl <nickk@tailscale.com>