apm-agent-nodejs
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add span.db.link to postgres spans?
See: elastic/apm-agent-nodejs#1482
In https://github.com/elastic/apm-agent-nodejs/issues/1482#issuecomment-548337835 @axw mentioned what "db.link" is for, in reference to Oracle. I'm not sure if something similar applies for PostgreSQL and whether it would be something practical for instrumentation to glean.
span.db.instance was added for pg instrumentation in #2882.