feat: add Instance_label to extractors

[GrayFlash]

closes #353

• postgres
• mysql
• mssql
• tableau

[GrayFlash]

@StewartJingga I have made changes to add instance_label as a part of config for the above 4 extractors. Wanted to know if sessionID instead of password&username is to be added for tableau. I am not sure if sql extractors will also need a sessionID since we use connection string there.

[mabdh]

@StewartJingga I have made changes to add instance_label as a part of config for the above 4 extractors. Wanted to know if sessionID instead of password&username is to be added for tableau. I am not sure if sql extractors will also need a sessionID since we use connection string there.

It is called auth token in tableau and not session id. If metabase has it, nothing is stopping us to add the similar flow for tableau.

[GrayFlash]

@mabdh @StewartJingga created a separate issue for it here. #358

[ravisuhag]

@GrayFlash @StewartJingga Do you think we can find a better name for this config instead of instance_label ?

[GrayFlash]

can we use record_label since we use it to identify records being extracted as a part of urn?? wdyt @ravisuhag @StewartJingga

[mabdh]

What about namespace?

[GrayFlash]

@mabdh @StewartJingga @ravisuhag even namespace seems fine in terms of conveying its purpose.

[StewartJingga]

@mabdh @StewartJingga @ravisuhag even namespace seems fine in terms of conveying its purpose.

namespace works, but I feel like it has a chance of having another meaning on some source. (e.g. tableau).

[mabdh]

namespace naming is actually inspired by this URN IETF doc. Namespace Specific String (NSS)

[GrayFlash]

@mabdh makes sense.

@StewartJingga @ravisuhag should we use namespace then??

[ravisuhag]

We can use identifier as well to address the concern @StewartJingga has. cc @mabdh @GrayFlash