I've been using InfluxDB for almost a year now. At one point around 9 months ago I had given up on it because it was a bit crashy, and the database just was growing too fast. But the promise behind it was too compelling and I started experimenting with newer versions around 6 months ago and it has been just great! Much easier to deal with than Graphite/collectd/carbon, telegraf has not been eating our servers like collectd was, CPU usage is way down... Loving InfluxDB. Still need to implement annotations and SNMP polling in telegraf, but it is awesome. We are even pushing some application stats into it.