3 types of metrics can be queried. V1 APIs were introduced since 6.x. Now they are a shell to V2 APIs.
1. Single value. Most default metrics are in single value. `getValues` and `getLinearIntValues` are suitable for this purpose.
1. Single value. Most default metrics are in single value. `getValues` and `getLinearIntValues` are suitable for this purpose.
1. Multiple value. A metric defined in OAL includes multiple value calculations. Use `getMultipleLinearIntValues` to obtain all values. `percentile` is a typical multiple value function in OAL.
1. Multiple value. A metric defined in OAL includes multiple value calculations. Use `getMultipleLinearIntValues` to obtain all values. `percentile` is a typical multiple value function in OAL.
1. Heatmap value. Read [Heatmap in WIKI](https://en.wikipedia.org/wiki/Heat_map) for details. `thermodynamic` is the only OAL function. Use `getThermodynamic` to get the values.
1. Heatmap value. Read [Heatmap in WIKI](https://en.wikipedia.org/wiki/Heat_map) for details. `thermodynamic` is the only OAL function. Use `getThermodynamic` to get the values.