Wasm runtime

The following runtimes are supported by Envoy:

Name	Description
envoy.wasm.runtime.v8	V8-based runtime
envoy.wasm.runtime.wamr	WAMR runtime
envoy.wasm.runtime.wasmtime	Wasmtime runtime
envoy.wasm.runtime.wavm	WAVM runtime
envoy.wasm.runtime.null	Compiled modules linked into Envoy

WAMR(WASM-Micro-Runtime), Wasmtime and WAVM runtimes are not included in Envoy release image by default.

Wasm runtime emits the following statistics:

Name	Type	Description
wasm.<runtime>.created	Counter	Total number of execution instances created
wasm.<runtime>.active	Gauge	Number of active execution instances