Log custom metrics for webalmanac

[max-ostapenko]

Now you can see custom metric logged by default from running unit tests with Web Almanac.

Applied formatting to privacy.js to trigger the 'changed custom metric' test.

---

Test websites:

• https://example.com/

[github-actions]

Custom metrics for https://almanac.httparchive.org/en/2022/

WPT test run results: http://webpagetest.httparchive.org/results.php?test=240616_Q8_6
Changed custom metrics values:

{
    "_privacy": {
        "privacy_wording_links": [
            {
                "text": "\n          Chapter 13: Privacy\n        "
            },
            {
                "text": "\n          Chapter 13: Privacy\n        "
            }
        ],
        "iab_tcf_v1": {
            "present": false,
            "data": null,
            "compliant_setup": null
        },
        "iab_tcf_v2": {
            "present": false,
            "data": null,
            "compliant_setup": null
        },
        "iab_usp": {
            "present": false,
            "privacy_string": null
        },
        "navigator_doNotTrack": false,
        "navigator_globalPrivacyControl": true,
        "document_permissionsPolicy": false,
        "document_featurePolicy": true,
        "referrerPolicy": {
            "entire_document_policy": null,
            "individual_requests": null,
            "link_relations": null
        },
        "media_devices": {
            "navigator_mediaDevices_enumerateDevices": false,
            "navigator_mediaDevices_getUserMedia": false,
            "navigator_mediaDevices_getDisplayMedia": false
        },
        "geolocation": {
            "navigator_geolocation_getCurrentPosition": false,
            "navigator_geolocation_watchPosition": false
        },
        "fingerprinting": {
            "counts": {
                "getimagedata": 2,
                "prefers-reduced-motion": 4,
                "resolvedoptions().timezone": 2,
                "gettimezoneoffset": 5,
                "devicememory": 5,
                "localstorage": 1
            },
            "likelyFingerprintingScripts": [
                "https://almanac.httparchive.org/static/js/almanac.js?v=096e38f74c72532860651812978526c5",
                "https://almanac.httparchive.org/static/js/send-web-vitals.js?v=b7224f484fe762e075d4838286ddb066"
            ]
        },
        "request_hostnames_with_cname": {
            "almanac.httparchive.org": [
                "ghs.googlehosted.com"
            ]
        },
        "ccpa_link": {
            "hasCCPALink": false,
            "CCPALinkPhrases": []
        }
    }
}

Custom metrics for https://example.com/

WPT test run results: http://webpagetest.httparchive.org/results.php?test=240616_T7_7
Changed custom metrics values:

{
    "_privacy": {
        "privacy_wording_links": [],
        "iab_tcf_v1": {
            "present": false,
            "data": null,
            "compliant_setup": null
        },
        "iab_tcf_v2": {
            "present": false,
            "data": null,
            "compliant_setup": null
        },
        "iab_usp": {
            "present": false,
            "privacy_string": null
        },
        "navigator_doNotTrack": false,
        "navigator_globalPrivacyControl": false,
        "document_permissionsPolicy": false,
        "document_featurePolicy": false,
        "referrerPolicy": {
            "entire_document_policy": null,
            "individual_requests": null,
            "link_relations": null
        },
        "media_devices": {
            "navigator_mediaDevices_enumerateDevices": false,
            "navigator_mediaDevices_getUserMedia": false,
            "navigator_mediaDevices_getDisplayMedia": false
        },
        "geolocation": {
            "navigator_geolocation_getCurrentPosition": false,
            "navigator_geolocation_watchPosition": false
        },
        "fingerprinting": {
            "counts": {},
            "likelyFingerprintingScripts": []
        },
        "request_hostnames_with_cname": {},
        "ccpa_link": {
            "hasCCPALink": false,
            "CCPALinkPhrases": []
        }
    }
}

[tunetheweb]

LGTM.

Will wait until crawl finished before merging though just in case!