Redshift security dashboard bugfix and enhancements

[yota-p]

Hello team, I would like to update the built-in dashboards. There are two points:

1. Bugfix: Boolean query error
   I found out that Query data error occurs when BOOL type is returned in the dashboard (e.g. select boolean_col;).
   I modified the SQL to convert BOOL into VARCHAR using following syntax: select decode(boolean_col, true, 'true', false, 'false').
   Left: before, right: after (usecreatedb, usesuper, usecatupd are BOOL)
   

2. Minor enhancement:
   Added links to the AWS document in the panel description. Users can use this link to jump to the document of each Redshift system table to inspect column definitions quickly.
   

[kevinwcyu]

Thanks for these fixes and improved documentation @yota-p.

In the Amazon Redshift Identities and Objects dashboard. The Group assigned to User panel has the following error for me.

Is this something that you see as well?

[yota-p]

Hi @kevinwcyu , thanks for taking a look.
I did some experiment and noticed that Node Graph panel shows this error when dataframe nodes returned no record.
For this case, it seems you don't have any GROUP assigned to a USER in Redshift.
If there's any GROUP assigned to a USER then this error will not occur.

In order to avoid this error, dataframe needs to return at least 1 record.
I modified the SQL to query a dummy record from Redshift, and then to filter out the dummy record from dataframe by using Transform feature in Grafana.

It's not an elegant workaround, but now the panel will show "No data" instead of the error above.

[kevinwcyu]

Thanks a lot for these enhancements @yota-p.

[yota-p]

@kevinwcyu Thanks for the approval! Can we merge the branch or are we waiting for something?