Getting "collected metrics xxx was collected before with the same name and label values"

[jdhanani1-zz]

I am trying to use postgres_exporter v0.7.0 (built with go1.11) with --auto-discover-databases.
I have 4 databases in the pg cluster. The prometheus started complaining with "server returned HTTP status 500 Internal Server Error"

So I looked at the metrics being scraped at the exporter end point using curl and I see bunch of messages not limited to below but for every metrics it collects.

• collected metric pg_postmaster_start_time_seconds label:<name:"server" value:”server11:4340” > gauge:<value:956422.90218 > was collected before with the same name and label values
• collected metric pg_wraparound_max label:<name:"server" value:”server11:4340" > untyped:<value:1.94266408e+08 > was collected before with the same name and label values

Please help identify the issue.

[jdhanani1-zz]

I did use --disable-default-metrics --disable-settings-metrics --auto-discover-databases flags.

[jdhanani1-zz]

Looks like duplicate of : Multi-DSN causes duplicate metric errors for built-in stat queries #296