Add unprefixed flag to #[metrics] macro
#153
Merged
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This change is twofold. First, it refactors the registry selection in
metrics::internal::Registriesto use boolean flags rather than separate methods to select a registry to use. As part of this, we add a combination of flags to return a registry without the global service name prefix that is normally present.Second, we add a new
unprefixedargument to themetricsproc-macro. If present, this argument causes all metrics in the associated module to be registered in the registry mentioned above. This works for both the "main" and the "optional" registry.I've added both a proc-macro expansion test and an integration test to validate the flag's functionality.