fix: Per-model metrics labels should be disabled by default

Motivation

#90 introduced support for per-model prometheus metrics but the intention was not to change the default behaviour and have this as something enabled explicitly via configuration.

However, it was inadvertently made the default.

Modifications

Change default behaviour to not include modelId/vModelId prometheus metric labels. This is important because model-mesh was designed primarily for use cases where there is a very large and changing number of individual models and those scenarios would result in a much greater number of individual metrics than prometheus can handle.

Result

Original behaviour restored

Signed-off-by: Nick Hill <nickhill@us.ibm.com>

src/main/java/com/ibm/watson/modelmesh/Metrics.java

@@ -172,7 +172,7 @@ public PrometheusMetrics(Map<String, String> params, Map<String, String> infoMet
             int port = 2112;
             boolean shortNames = true;
             boolean https = true;
-            boolean perModelMetricsEnabled = true;
+            boolean perModelMetricsEnabled = false;
             String memMetrics = "all"; // default to all
             for (Entry<String, String> ent : params.entrySet()) {
                 switch (ent.getKey()) {