To learn more about Prometheus's query language, including how to do compute percentiles from histograms, how to deal with timestamp-based metrics, or how to query for service instance health, head on to How To Query Prometheus on Ubuntu 14.04 Part 2.
Fungus gnats are not at all harmful to people or pets. However, when you begin to find them swarming plants in the house or greenhouse, it's time to get rid of the fungus gnats. First things first, make sure fungus gnats are the real culprit; they are often confused with fruit flies. Fungus gnats look like small mosquitoes just 1/16 inch to 1/8 inch long.
There are several preventative measures that will be helpful to get rid of fungus gnats. Since fungus gnats thrive under moist conditions, especially in decaying vegetation and fungi, let potting soil dry out between waterings. Fungus gnats often become a problem in autumn and winter when plants are brought indoors.