Crate metricus

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§metricus

Contains building blocks.

Counter: Provides methods to create a new counter, increment it, and increment it by a specified amount. It automatically deletes the counter when it is dropped.
Histogram: Facilitates the creation of a new histogram, recording of values, and generation of spans for timing operations. The Histogram does not have an inherent notion of measurement units (e.g., milliseconds, bytes) and some convention should be in place.
MetricsHandle: Metrics backend handle.
Span: Used for measuring how long given operation takes. The duration is recorded in nanoseconds.

CounterOps: Defines a series of operations that can be performed on a Counter.
HistogramOps: Defines a series of operations that can be performed on a Histogram.
Metrics: Common interface for metrics backend. Each new backend must implement this trait. Implementations must be safe for concurrent use or be used in a strictly single-threaded manner, because the global metrics handle can be shared across threads.

empty_tags: Returns empty tags.
get_metrics_backend_name: Get name of the active metrics backend.
set_metrics: Set a new metrics backend. This must be called before any counters or histograms are created (including through macros), because metric objects cache the active handle. It should also be called before any worker threads start so hot-path loads can use relaxed ordering. Otherwise, all metrics calls will delegate to the NoOpMetrics.