Source code of WSO2 GREG 4.6 - wso2

I'm looking for the source code os WSO2 Registry 4.6. I have installed the binaries but I have not been able to find the sources.
Is the source code available?
Thanks in advance

WSO2 Governance Registry related sources available in ckunk 2 tag. If you building product from the source, Please refer "Building from Source" guide.

Find the wso2 Governance Registry source from here.
Note: make sure you follow this answer as well.

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I'm currently following the WSO2 documentation on installing the BPS tooling plugin and the link given for the BPS tooling is not working(Step 4).
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Any resolution or an alternative method to install the same is highly appreciated.
Thanks in advance.
You should not be referring to these documents. These are for the old BPS server, which was later merged with EI and now it's discontinued. BPMN and BPEL extensions are already there in Integration Studio, hence you don't have to install any additional plugins. You can simply create a new project with the relevant type and start building your workflows. Here are tutorials you can refer to.

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In WSO2 products, and specifically in API Manager (2.1.0), we have to modify a lot of configuration files just to start.
We have seen that some configuration files (api-manager.xml, carbon.xml) use configurations variables. E.g., ${admin.username} to substitute by admin user.
We have found an old post (2016) explaining the use of configuration variables in WSO2 products
https://medium.com/#shan1024/overriding-configurations-in-wso2-products-using-deployment-properties-file-f096e96f782d
But we are not able to find the deployment.properties files referenced in that post, neither and official documentation.
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As far as I know, deployment.yaml was introduced in Carbon kernel 5.2 onwards. But WSO2 APIM 2.x is based on Carbon kernel 4.4.X. Therefore APIM 2.x doesn't support that.
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I seached and found below link which might be helpful:
http://blog.rukspot.com/2015/09/publishing-apim-runtime-statistics-to.html
But the bad thing is for unknown reason I tried times to access this link ,,all failed.
Can anybody help to paste the content of above link here or just send a private mail to me via my mail : menglong567#aliyun.com
That would be very appreaciated !
Please find the official documentation for WSO2 API-M 1.9.0 statistics configurations in here.
All the necessary information is covered in the official doc.

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It is located inside <ESB_HOME>/bin directory.
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Are there nightly builds of the WSO2 GREG somewhere? I'm behind a customer's proxy which has a weird configuration, building from source is getting very difficult. My specific need is to test the new WADL support, which doesn't look available in the 4.5.0 distribution. On the other hand, is there any alternative way to test the new WADL support without building the GREG from scratch?
If you need to evaluate nightly build the location given is correct. But WADL support has been removed from WSO2 4.5.1 distribution at the moment. So this binary pack does not include it.