Update pg_long_running_transactions.go

[jyothikirant-sayukth]

To extract time in seconds for pg_long_running_transactions_oldest_timestamp_seconds query which currently returns epoch time.

[alphabet5]

I ran into the same issue, and had the same solution. This works as expected. (I'm not a maintainer, so I'm not sure what approving does, but LGTM.)

[alphabet5]

Tagging @Sticksman and @SuperQ because you guys worked on the original pr and I'm not really sure what the process is here. Is there anything I can do to help get this into a release?

[alphabet5]

I modified the query to exclude a few more things. idle was not matching idle in transaction queries, and there are a few other common long running queries that are not impactful. I'm not sure if this is useful for everyone though.

	longRunningTransactionsQuery = `
	SELECT
			COUNT(*) as transactions,
			MAX(EXTRACT(EPOCH FROM clock_timestamp() - pg_stat_activity.xact_start)) AS oldest_timestamp_seconds
	FROM pg_catalog.pg_stat_activity
	WHERE state NOT IN ('idle', 'idle in transaction')
			AND query NOT LIKE 'autovacuum:%'
			AND NOT (query ~* '^VACUUM( ANALYZE)?(?! FULL)')
			AND pg_stat_activity.xact_start IS NOT NULL
			AND NOT (query ~* '^REFRESH MATERIALIZED VIEW CONCURRENTLY')
			AND NOT (query ~* '^BEGIN ISOLATION LEVEL READ UNCOMMITTED');
	`

[roock]

Would be great to have this fixes somewhen, I already reported it in April .