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sorry for open a pull request for such a vintage OS, but the change is small and node exporter works reliable there after the patch (with go 1.4.2).
The only difference that caused a parsing error is a missing memory field in the UDP section of sockstat, i made the extraction of udp memory from sockstat optional with this patch.
ps.: just in case someone finds this post in need of a prometheus node-exporter for RHE4, one also needs a patched go 1.4.2