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.
It is the larvae of the fungus gnats that do the most damage. The adults live about a week, but during that time they lay hundreds of eggs in the soil of your potted plants. They are particularly attracted to damp soil that is rich in organic matter.