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pg_stat_activity: document client_port being null
As suggested by Stephen Frost. Discussion: https://postgr.es/m/20191104160605.GC6962@tamriel.snowman.net
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doc/src/sgml/monitoring.sgml

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@@ -652,7 +652,8 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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<entry><structfield>client_port</structfield></entry>
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<entry><type>integer</type></entry>
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<entry>TCP port number that the client is using for communication
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with this backend, or <literal>-1</literal> if a Unix socket is used
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with this backend, or <literal>-1</literal> if a Unix socket is used.
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If this field is null, it indicates that this is an internal server process.
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</entry>
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</row>
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<row>

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