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P4 Server Administration Documentation | 2025.1

# Triggers and extensions

Triggers and P4 server extensions allow you to customize parts of P4 Server with user-supplied logic.

| Server Extensions | Triggers
--- | --- | ---
Release | New in 2019.1 | Have been a feature of P4 Server for twenty years
Status | Supported as of 2019.1 | Remain fully supported
Environment | Part of the P4 product executables. No external dependencies. Written in the Lua programming language. Not platform-specific. | An external program supplied and managed by the P4 administrator.
Starting point for command-line help | command-line: p4 help extension | command-line: p4 help triggers

To learn about P4 server extensions, see Extensions.

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