Document WASM extension metrics #13426
Description
Title: Document WASM extension metrics
Description:
We see these coming in but do not know which parts (if any) are tags and what they represent:
wasm.envoy.wasm.runtime.null.active
wasm.envoy.wasm.runtime.null.created
wasm_vm.envoy.wasm.runtime.null.active
wasm_vm.envoy.wasm.runtime.null.cloned
wasm_vm.envoy.wasm.runtime.null.created
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