Changes to Metric search

added the optional property items/doc_last_modified to the response with the 200 status

added the new optional query request parameter exact

the mandatory response header phe-website-request removed for the status 200

the mandatory response header x-phe-media-type removed for the status 200

the optional response header phe-server-loc removed for the status 200

added the optional property items/deprecated to the response with the 200 status

added the required property items/last_update to the response with the 200 status

the mandatory response header ukhsa-website-request removed for the status 200

the mandatory response header x-ukhsa-media-type removed for the status 200

removed the required property items/last_update from the response with the 200 status

the optional response header ukhsa-server-loc removed for the status 200

removed the optional property items/deprecated from the response with the 200 status

added the new optional query request parameter category

added the new optional query request parameter tags

the mandatory response header phe-website-request removed for the status 200

the mandatory response header x-phe-media-type removed for the status 200

the optional response header phe-server-loc removed for the status 200

added the optional property items/deprecated to the response with the 200 status

added the required property items/category to the response with the 200 status

added the required property items/metric_name to the response with the 200 status

added the required property items/tags to the response with the 200 status

added the media type application/json for the response with the status 200

added the new required header request parameter Accept

added the non-success response with the status 400

added the non-success response with the status 404

added the non-success response with the status 429

added the non-success response with the status 500