heitatta

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It seems to me that pg_current_wal_lsn() function call caused this issue in [queries.go ](https://github.com/prometheus-community/postgres_exporter/blob/9cfa1321158af0eb9f6b11d06eebd064e57c697b/cmd/postgres_exporter/queries.go#L79) Other collectors use an idiom like: `(case pg_is_in_recovery() when 't' then null else pg_current_wal_lsn() end) AS...