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resource terminology and API (open-telemetry#56)
* resource terminology and API * addressed code review comments
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# Resources API | ||
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[Resource](../terminology.md#resources) represents the entity producing | ||
telemetry. The primary purpose of resources as a first-class concept in the API | ||
is decoupling of discovery of resource information from exporters. This allows | ||
for independent development and easy customization for users that need to | ||
integrate with closed source environments. API MUST allow creation of | ||
`Resources` and associating them with telemetry. | ||
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When used with distributed tracing resource can be associated with the | ||
[Tracer](tracing-api.md#tracer) or individual | ||
[SpanData](tracing-api.md#spandata). When associated with `Tracer`, all `Span`s | ||
produced by this `Tracer` will automatically be associated with this `Resource`. | ||
When associated with the `SpanData` explicitly for out-of-band spans - | ||
`Resource` that is set on `Tracer` MUST be ignored. | ||
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**TODO**: explain how resource is associated with metrics. | ||
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## Resources SDK | ||
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TODO: notes how Resources API is extended when using `SDK`. https://github.com/open-telemetry/opentelemetry-specification/issues/61 | ||
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## Resource creation | ||
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API defines two ways to instantiate an instance of `Resource`. First, by | ||
providing a collection of labels - method [Create](#create). The typical use of | ||
this method is by creating resource from the list of labels taken from | ||
environment variables, metadata API call response, or other sources. | ||
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Second, by merging two `Resource`s into a new one. The method [Merge](#merge) is | ||
used when a `Resource` is constructed from multiple sources - metadata API call | ||
for the host and environment variables for the container. So a single `Resource` | ||
will contain labels for both. | ||
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Lastly, it is a good practice for API to allow easy creation of a default or | ||
empty `Resource`. | ||
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Note that the OpenTelemetry project documents certain ["standard | ||
labels"](../semantic-conventions.md) that have prescribed semantic meanings. | ||
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### Create | ||
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Creates a new `Resource` out of the collection of labels. This is a static | ||
method. | ||
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Required parameter: | ||
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Collection of name/value labels where both name and value are strings. | ||
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### Merge | ||
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Creates a new `Resource` that is a combination of labels of two `Resource`s. For | ||
example, from two `Resource`s - one representing the host and one representing a | ||
container, resulting `Resource` will describe both. | ||
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Already set labels MUST NOT be overwritten unless they are empty string. Label | ||
key namespacing SHOULD be used to prevent collisions across different resource | ||
detection steps. | ||
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Required parameter: | ||
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`Resource` to merge into the one, on which the method was called. | ||
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## Resource operations | ||
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API defines a resource class with a single getter for the list of labels | ||
associated with this resource. `Resource` object should be assumed immutable. | ||
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### GetLabels | ||
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Returns the read only collection of labels associated with this resource. Each | ||
label is a string to string name value pair. The order of labels in collection | ||
is not significant. The typical use of labels collection is enumeration so the | ||
fast access to the label value by it's key is not a requirement. |
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