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A `View` configuration parameters can be used for the following
purposes:
1. Match instruments: When an instrument matches a view, measurements
received by that instrument will be processed.
2. Customize metric streams: A metric stream is identified by a match
between a view and an instrument and a set of attributes. The metric
stream can be customized by certain attributes of the corresponding view.
The attributes documented next serve one of the previous two purposes.
Args:
instrument_type: This is an instrument matching attribute: the class the
instrument must be to match the view.
instrument_name: This is an instrument matching attribute: the name the
instrument must have to match the view. Wild card characters are supported. Wild
card characters should not be used with this attribute if the view has also a
``name`` defined.
meter_name: This is an instrument matching attribute: the name the
instrument meter must have to match the view.
meter_version: This is an instrument matching attribute: the version
the instrument meter must have to match the view.
meter_schema_url: This is an instrument matching attribute: the schema
URL the instrument meter must have to match the view.
name: This is a metric stream customizing attribute: the name of the
metric stream. If `None`, the name of the instrument will be used.
description: This is a metric stream customizing attribute: the
description of the metric stream. If `None`, the description of the instrument will
be used.
attribute_keys: This is a metric stream customizing attribute: this is
a set of attribute keys. If not `None` then only the measurement attributes that
are in ``attribute_keys`` will be used to identify the metric stream.
aggregation: This is a metric stream customizing attribute: the
aggregation instance to use when data is aggregated for the
corresponding metrics stream. If `None` an instance of
`DefaultAggregation` will be used.
This class is not intended to be subclassed by the user.
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