Gregor Jasny 7436042045 Add prometheus-cpp (and civetweb) (#4694)
* [prometheus-cpp] Initial port

Closes: jupp0r/prometheus-cpp#130

* [civetweb] Initial port

* [prometheus-cpp][civetweb] Cleanup. Update to 0.6.0.
2018-11-14 11:16:07 -08:00
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