Be more precise about concurrency requirements
Signed-off-by: beorn7 <beorn@soundcloud.com>
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@ -40,7 +40,8 @@ type Collector interface {
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// Collector may yield any Metric it sees fit in its Collect method.
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//
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// This method idempotently sends the same descriptors throughout the
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// lifetime of the Collector.
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// lifetime of the Collector. It may be called concurrently and
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// therefore must be implemented in a concurrency safe way.
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//
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// If a Collector encounters an error while executing this method, it
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// must send an invalid descriptor (created with NewInvalidDesc) to
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@ -107,9 +107,6 @@ type Registerer interface {
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// Collector, and for providing a Collector that will not cause
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// inconsistent metrics on collection. (This would lead to scrape
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// errors.)
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//
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// It is in general not safe to register the same Collector multiple
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// times concurrently.
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Register(Collector) error
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// MustRegister works like Register but registers any number of
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// Collectors and panics upon the first registration that causes an
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