Add the URL label to metrics securely #966
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Small feature addition.
Sometimes is useful to have the endpoint URL in metrics labels so we can include that as part of alert messages when these metrics are scraped via prometheus.
This is related to #875 with the requested addition of sanitizing the URL to prevent query parameters, which may contain secrets, from leaking to metrics.
Additionaly, added a new test to validate query parameters are not being exposed.