Allow passing owned strings as metric key. #170
Merged
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Previously, due to the way the macros were written, users could specify a metric key as either a string literal or an expression that pointed to an owned string, due to the
Into<T>
implementations forKey
and the way the macros handled the input arguments. While not an explicit design goal, this was broken in the rewrite for 0.13: #165This PR reworks the macros such that they can properly handle either a string literal or owned string as the metric key. Minimal work was required on the
Key
/KeyData
side as we mostly had a sufficient set offrom_*
methods. The real work is in the macro argument parsing and code generation itself, dealing with the matrix of combinations: is the name static, are the labels static, and all the combinations in thereof.