1. A method for dynamic rules-based peg counting comprising: (a) at a plurality of signaling message site collectors, generating peg counter instances by comparing monitored signaling messages to existing peg counter definitions, each peg counter instance including an accumulator value indicating a number of the signaling messages that match one of the existing peg counter definitions and an identifier for identifying the associated peg counter definition; (b) receiving new peg counter definitions; and (c) in response to receiving the new peg counter definitions, switching to the new peg counter definitions on the fly and generating peg counter instances based on the new peg counter definitions.