Improved techniques for flow analysis in messaging systems are disclosed. For example, a method for finding correlations between messages of a system based on content includes the following steps. For one or more executions of the system, obtaining the messages of the system, wherein each message has a schema associated therewith. The messages are categorized into groups, wherein each group has a common schema. Pairs of messages from disparate groups are found wherein, for the messages of a pair, there is a feature in common in their contents.