docs: update Message Example payload type

[Pakisan]

According to JSON Schema MessageExample.payload may be of any type

See:

• fix: parse message payload of any type other than map of String to Object jasyncapi#208
• [BUG] fix type of payload in MessageExample  spec-json-schemas#560
• [Docs Bug 🐞 report]: wrong type of payload in MessageExample website#3530

[fmvilas]

LGTM 👍

[fmvilas]

Changed my mind after thinking a bit more.

[fmvilas]

I think the change is justified for payload as it can be an array, for instance. However, I'm not sure in which cases headers could be anything different than a map.

[Pakisan]

@fmvilas Yep, I thought same way, but after this I re-read definitions and it may by of any type

In Message we are defining schema for payload and headers. This two properties are JSON Schema or Multi format Schema

So they can be of any defined and valid JSON Schema type - string, number, object, etc. Or Avro type

This is main reason to define headers and payload in MessageExample as any type and validate them trough it's schemas in Message object

[fmvilas]

The definition of headers explicitly says:

Schema MUST be a map of key-value pairs.

So it can't be any, right?

[derberg]

headers

IMHO headers should stay as it is. It was always like this, in previous versions too, key/value as this is who headers look like.

So they can be of any defined and valid JSON Schema type - string, number, object, etc. Or Avro type

spec is more specific in case of headers if you compare with payload

Schema MUST be a map of key-value pairs

payload

In case of payload. This is what it was before v3 which makes sense as payload is any

<a name="messageExampleObjectHeaders"></a>headers | `Map[string, any]` | The value of this field MUST validate against the [Message Object's headers](#messageObjectHeaders) field.

<a name="messageExampleObjectPayload"></a>payload | `any` | The value of this field MUST validate against the [Message Object's payload](#messageObjectPayload) field.

in v3 we introduced Multi Format Schema Object, so payload can also be payload.schema and payload.schemaFormat and definition of payload was changed from any to Multi Format Schema Object | Schema Object | Reference Object but yeah, because of Schema Object it is still basically any.

which means message payload example should also be any.

I went through #910 but I see that we were 100% focused there on the message.payload definition and Multi Format Schema Object that the change in Message Example Object Payload type was overlooked.

[Pakisan]

@fmvilas @derberg I have returned Map[string, any] to headers

[fmvilas]

Thanks, @Pakisan! Approved ✅

[sonarqubecloud]

Quality Gate passed

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[fmvilas]

Looks good to me 👍

[derberg]

@Pakisan please adjust the description and PR title to reflect the final scope