/usr/share/doc/cadabra/properties/Metric.tex is in cadabra 1.46-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | \cdbproperty{Metric}{{\it signature={\sf integer}}}
Labels the object as a symmetric tensor, and optionally gives it the
indicated signature through the {\tt signature} parameter.
\begin{screen}{1,2,3}
g_{m n}::Metric(signature=1).
g_{m n} A^{n p};
@eliminate_metric!(%);
A_{m}^{p};
\end{screen}
Objects declared as \subsprop{Metrics} can be used to automatically
raise or lower indices using the
\subscommand{eliminate\_metric} command.
\cdbseealgo{eliminate_metric}
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