.. _config_wasm_runtime:

Wasm runtime

The following runtimes are supported by Envoy:

.. csv-table:: :header: Name, Description :widths: 1, 2

envoy.wasm.runtime.v8, "V8 <https://v8.dev>-based runtime" envoy.wasm.runtime.wamr, "WAMR <https://github.com/bytecodealliance/wasm-micro-runtime> runtime" envoy.wasm.runtime.wasmtime, "Wasmtime <https://github.com/bytecodealliance/wasmtime>_ runtime" envoy.wasm.runtime.null, "Compiled modules linked into Envoy"

WAMR(WASM-Micro-Runtime), Wasmtime runtime is not included in Envoy release image by default.

Wasm runtime emits the following statistics:

.. csv-table:: :header: Name, Type, Description :widths: 1, 1, 2

wasm.<runtime>.created, Counter, Total number of execution instances created wasm.<runtime>.active, Gauge, Number of active execution instances