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Add description of pg_stat directory into doc.

Back-patch to 9.3 where pg_stat directory was introduced.

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Original file line number	Diff line number	Diff line change
`@@ -186,7 +186,7 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re`
`186`	`186`	`For better performance, <varname>stats_temp_directory</> can be`
`187`	`187`	`pointed at a RAM-based file system, decreasing physical I/O requirements.`
`188`	`188`	`When the server shuts down cleanly, a permanent copy of the statistics`
`189`		`- data is stored in the <filename>global</filename> subdirectory, so that`
	`189`	`+ data is stored in the <filename>pg_stat</filename> subdirectory, so that`
`190`	`190`	`statistics can be retained across server restarts. When recovery is`
`191`	`191`	`performed at server start (e.g. after immediate shutdown, server crash,`
`192`	`192`	`and point-in-time recovery), all statistics counters are reset.`

Lines changed: 6 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -103,6 +103,12 @@ Item`
`103`	`103`	`<entry>Subdirectory containing exported snapshots</entry>`
`104`	`104`	`</row>`
`105`	`105`
	`106`	`+<row>`
	`107`	`+ <entry><filename>pg_stat</></entry>`
	`108`	`+ <entry>Subdirectory containing permanent files for the statistics`
	`109`	`+ subsystem</entry>`
	`110`	`+</row>`
	`111`	`+`
`106`	`112`	`<row>`
`107`	`113`	`<entry><filename>pg_stat_tmp</></entry>`
`108`	`114`	`<entry>Subdirectory containing temporary files for the statistics`

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