Take this example — here we have 3 instances of either Tomcat or ColdFusion installed on one single server. If you wished to analyze the metric information from all three instances, then you would require:
1 x FusionReactor license (either FusionReactor Standard or Enterprise) — 1 license covers 1 physical server, no matter how many instances you have configured
1 x FusionAnalytics M Pack (containing 3 Data Collectors) — 1 Data Collector for each instance being analyzed