Missing NAV documentation for Metadata/NAV

[iramiller]

Summary of Bug

The metadata module has a spec folder with a description of all messages supported, unfortunately there seems to be nothing on how the NAV function works.

Version

1.19+ - HEAD

Steps to Reproduce

This message exists:

provenance/proto/provenance/metadata/v1/tx.proto

Lines 605 to 614 in c702324

	// MsgAddNetAssetValuesRequest defines the Msg/AddNetAssetValues request type
	message MsgAddNetAssetValuesRequest {
	option (cosmos.msg.v1.signer) = "signers";
	option (gogoproto.equal) = false;
	option (gogoproto.goproto_getters) = false;
	string scope_id = 1;
	repeated string signers = 2;
	repeated NetAssetValue net_asset_values = 3 [(gogoproto.nullable) = false];
	}

But there are no documented example in x/metadata/spec/03_messages.md and further the events published for this update are not documented in x/metadata/spec/06_events.md so it isn't clear which events should be looked for when an update is published.

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