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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">(multi-)dimensional metric means there is more information attached to one measurement than the metric's name and value. So instead of encoding this information in the metric's name and ending up with many similar metrics, this information is added as key/value pairs to each measurement.</p> <p style="margin: 10px 0 0 0">For example, I currently have this metric defined in admin/metrics.xml:<br> <tt>metricContext.addTimer("idp.profile." + profile + ".duration", "DecodeMessage", "WriteAuditLog");</tt><br> and it produces several timers:</p>
<ul class="alternate" type="square">
<li>idp.profile.saml2.sso.browser.duration</li>
<li>idp.profile.saml2.logout.duration</li>
<li>etc.<br> each with their own name and values.<br> By contrast, in a multi-dimensional system, this would be expressed with one metric name "idp_profile_duration" and several values of a "profile" key, like so:</li>
<li>idp_profile_duration {profile="saml2_sso_browser"}</li>
<li>idp_profile_duration {profile="saml2_logout"}</li>
<li>etc.<br> each with their own values. This opens much more possibilities when aggregating or computing monitoring data, because this duration can be aggregated with or without the "profile" key.</li>
</ul> <p style="margin: 10px 0 0 0">Another example that perhaps is more expressive is HTTP request count. Here is what the Spring Boot metrics Actuator reports for one of our applications:<br> http_server_requests_seconds_count{app="affiliation-api",exception="None",instance="<hostname>",job="eduid-affiliation-api",method="GET",outcome="SUCCESS",service="eduid",status="200",uri="/Affiliations/{swissEduPersonUniqueID}"} 4201428<br> http_server_requests_seconds_count{app="affiliation-api",exception="None",instance="<hostname>",job="eduid-affiliation-api",method="POST",outcome="SUCCESS",service="eduid",status="201",uri="/Affiliations"} 4817<br> and so on for all possible values of "method", "status", "uri" and "outcome". With such a format, it is possible to either count all requests or filter the one with are interested in by any combination of keys/values, e.g. counting only requests whose HTTP status is 500. It is much more powerful, expressive and much less messy than having one metric per HTTP status (or per HTTP method, etc.).</p> </td>
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