Sometimes slow responsiveness of /meta_knowledge_graph endpoint

[CaseyTa]

The /meta_knowledge_graph endpoint sometimes responds in <5 seconds and sometimes takes >30 seconds to respond. Since this endpoint is queried often in Translator ecosystem, it would be good to improve the responsiveness of this endpoint, potentially by adding caching.

Related issue in Translator Feedback repo for history of issues experienced by ARA teams:
NCATSTranslator/Feedback#593

[CaseyTa]

@isbluis reporting that /meta_knowledge_graph is still having problems in dev and CI.
NCATSTranslator/Feedback#593 (comment)

I'm seeing 500 internal server errors in all environments right now

@micheldumontier Is there anyone who can look into this?

[micheldumontier]

@ensaremirerol could you chec, on the api service https://api.collaboratory.semanticscience.org/docs

[micheldumontier]

This was solved with a change in the nanopub SPARQL URL ac7e184

[micheldumontier]

@CaseyTa keep an eye on the translator CI and report back if this solves the problem