Commits on Sep 30, 2019

1. feat: add ipfs version info to prometheus metrics …

   Adds `ipfs_info` prometheus metric with version and commit info
   
   ```prometheus
   ipfs_info{commit="9ea7c6a11-dirty",version="0.5.0-dev"} 1
   ```
   
   This follows the same pattern as go and other systems, adding a gauge metric that is set to 1, with the version info addeds as labels.
   
   This is a common pattern for prometheus. It lets operators merge version info into other prometheus metrics by multiplying it with the other stat, as described in https://www.robustperception.io/exposing-the-software-version-to-prometheus
   
   For example, we already expose the go version info as
   
   ```prometheus
   go_info{version="go1.12.9"} 1
   ```
   
   License: MIT
   Signed-off-by: Oli Evans <oli@tableflip.io>

   

   olizilla committed Sep 30, 2019
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