Module mz_ore::metrics::delete_on_drop

source ·
Available on crate feature metrics only.
Expand description

Support for metrics that get removed from their corresponding metrics vector when dropped.

§Ownership & life times

This kind of data type is realized by a struct that retains ownership of the labels used to create the spin-off metric. The created metric follows these rules:

  • When passing references, the metric must not outlive the references to the labels used to create it: A 'static slice of static strings means the metric is allowed to live for the 'static lifetime as well.
  • Metrics created from references to dynamically constructed labels can only live as long as those labels do.
  • When using owned data (an extension over what Prometheus allows, which only lets you use references to refer to labels), the created metric is also allowed to live for 'static.

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