For a customer with 8 APM hosts, which monthly indexing scenario would result in additional costs?

The scenario that results in additional costs is the one where Host A indexes 200,000 spans, Host B indexes 7,000,000 spans, and Host C indexes 900,000 spans.

In application performance monitoring (APM), most pricing models are based on metrics such as the number of spans indexed. Each span is an instance of a trace being captured, which reflects user transactions or interactions within an application. In this case, the total number of spans indexed across all hosts is critical in determining the cost.

With Host B indexing a significant 7,000,000 spans, it represents an exceptionally high volume compared to typical indexing levels. This substantial volume would likely exceed included thresholds within a pricing structure, resulting in overage charges.

In contrast, the other scenarios present a more balanced or lower distribution of span indexing across the hosts. For instance, in another option where span totals are more evenly distributed or fall below generally acceptable limits, they would not incur the same high level of additional costs as seen in the scenario with Host B.

Therefore, the option indicating Host B's high span indexing is the one that would most significantly impact cost based on the indexing structure used.