Werk #12483: Event rates in graphs can be of very small magnitude

Event rates were displayed with at most a presision of 2 decimals on the graphs, and was generally a good format. Yet, there are some cases when monitoring very sporadic events, graphs would show a scale containing only zeros.

After this werk, event rates follow the same scientific notation used on other metrics like floating point numbers, counts and percent. This allows to appropiately display numbers regardless of their domain range.

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