Embodiments are directed to managing operations over a network. An event associated with network operations may be provided. A hash function may generate key values that correspond to words included in message information associated with the event. A message vector may be generated based on the key values such that each component in the message vector that corresponds to a key value is set to one. Group vectors may be determined such that each group vector is associated with an event group. Similarity scores may be generated for the group vectors based on the message vector and the group vectors such that each group vector corresponds to a separate similarity score. If the similarity scores exceed a threshold, the event may be associated with event groups associated with a group vector that correspond similarity score that exceeds the threshold.