In the previous sections, we spent some time learning how to manage the horizontal and vertical display of our graph data. Now, we'll look at a key piece of graph display that is often overlooked: the legend. On many graphs, the legend seems like an afterthought, often floating in some non-specific whitespace where there's a convenient lack of data.
Grafana is somewhat more definitive about the legend. It lives below the graph (or to its right) and can take on a flow or a table format; that's it. However, as we've seen, the label content of the graph can be set by the ALIAS BY field, and that field can be matched to the series overrides. It's that functionality that we can leverage by using the legend interface.
Setting legend contents
Let's start with another graph, again for temperature. Use the following query settings:
- FROM: temperature
- SELECT: field (value)mean () ...