put pixel back

Signed-off-by: Alexa Kreizinger <alexakreizinger@gmail.com>

Author: alexakreizinger

pipeline/processors/metrics-selector.md

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 The _Metrics Selector_ processor lets you choose which metrics to include or exclude, similar to the [Grep](../pipeline/filters/grep) filter for logs.
 
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 ## Configuration parameters
 
 The Metrics Selector processor supports the following configuration parameters: