ID: 15662
Title: Bug fixes for
<tt>cmk.gui.plugins.metrics.utils.indexed_color</tt>
Component: metrics
Level: 1
Class: Bug fix
Version: 2.3.0b1
This werk is mainly relevant to users who deploy or develop custom Checkmk plugins. For
all other
users, the werk might result in some changes regarding the colors of certain metrics in
graphs.
The above mentioned function, also available via
<tt>cmk.gui.plugins.metrics.indexed_color</tt>,
computes colors for graphs. It was buggy in multiple ways:
LI: There was no validation of the input arguments <tt>idx</tt> and
<tt>total</tt>. We now ensure that <tt>0 <= idx <=
total</tt> and <tt>total > 0</tt>. If these requirements are
violated, an error is raised.
LI: <tt>indexed_color</tt> crashed for certain (valid) parameter combinations.
For small values of <tt>idx</tt>, <tt>indexed_color</tt> returns
values from a fixed set of pre-defined colors. Once this set was exhausted, the function
crashed if <tt>idx</tt> was close to <tt>total</tt>.
LI: Depending on the value of <tt>total</tt>,
<tt>indexed_color</tt> produced very dark colors after exhausting the
pre-defined set. Instead, we now always start with the same brightness and then then
become successively darker.
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