derp: add server version to /debug, expvars #652
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josharian
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bradfitz
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bradfitz
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This will make it easier for a human to tell what version is deployed, for (say) correlating line numbers in profiles or panics to corresponding source code. It'll also let us observe version changes in prometheus. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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