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Metrics: Add specs on Gauge APIs #248
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songy23
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Mar 14, 2019
bogdandrutu
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Mar 15, 2019
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songy23
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metrics/Gauge.md
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| ## Derived Gauge API | ||
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| The value that is published for gauges is an instantaneous measurement of an `int64` or `double` value. This gauge is self sufficient once created, so users should never need to interact with it. The value of the gauge is observed from the `object` and a `callback function`. The callback function is invoked whenever metrics are collected, meaning the reported value is up-to-date. The implementation should keep a `WeakReference` to the object and it is the user's responsibility to manage the lifetime of the object. |
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this should explain behavior of a derived gauge in case when object was garbage collected since it's talking about WeakReference.
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This is the language (in this case Java) specific details, removed from the specs.
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@bogdandrutu @SergeyKanzhelev PTAL once you have time. |
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| The following general operations MUST be provided by the API: | ||
| * Defining a `name`, `description`, `unit`, `labelKeys`, `resource` and `constantLabels` which are fixed labels that always apply to a gauge. This should give back the gauge object to get or create time series, remove time series and clear all time series. | ||
| * `name`: a string describing the name of the metric, e.g. "vm_cpu_cycles" or "queue_size". Names MUST be unique within the library. It is recommended to use names compatible with the intended end usage. |
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Any restriction on the formatting of a name?
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AFAIK there is no restriction on the length and it may contain any Unicode characters.
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Fixes #240