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diff -ur munin-2.0.42.orig/plugins/node.d/postfix_mailqueue.in munin-2.0.42/plugins/node.d/postfix_mailqueue.in
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--- munin-2.0.42.orig/plugins/node.d/postfix_mailqueue.in	2018-09-21 05:11:11.000000000 +0300
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+++ munin-2.0.42/plugins/node.d/postfix_mailqueue.in	2018-09-30 13:33:21.825373214 +0300
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@@ -103,7 +103,7 @@
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         cat <<'EOF'
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 graph_title Postfix Mailqueue
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 graph_vlabel Mails in queue
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-graph_category postfix
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+graph_category mail
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 graph_total Total
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 active.label active
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 deferred.label deferred
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diff -ur munin-2.0.42.orig/plugins/node.d/postfix_mailstats.in munin-2.0.42/plugins/node.d/postfix_mailstats.in
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--- munin-2.0.42.orig/plugins/node.d/postfix_mailstats.in	2018-09-21 05:11:11.000000000 +0300
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+++ munin-2.0.42/plugins/node.d/postfix_mailstats.in	2018-09-30 13:33:14.492320072 +0300
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@@ -141,7 +141,7 @@
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     print "graph_vlabel mails / \${graph_period}\n";
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     print "graph_scale  no\n";
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     print "graph_total  Total\n";
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-    print "graph_category postfix\n";
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+    print "graph_category mail\n";
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     print "graph_period minute\n";
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     print "delivered.label delivered\n";
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     print "delivered.type DERIVE\n";
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diff -ur munin-2.0.42.orig/plugins/node.d/postfix_mailvolume.in munin-2.0.42/plugins/node.d/postfix_mailvolume.in
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--- munin-2.0.42.orig/plugins/node.d/postfix_mailvolume.in	2018-09-21 05:11:11.000000000 +0300
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+++ munin-2.0.42/plugins/node.d/postfix_mailvolume.in	2018-09-30 13:33:06.602262890 +0300
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@@ -133,7 +133,7 @@
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     print "graph_args --base 1000 -l 0\n";
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     print "graph_vlabel bytes / \${graph_period}\n";
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     print "graph_scale yes\n";
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-    print "graph_category postfix\n";
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+    print "graph_category mail\n";
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     print "volume.label delivered volume\n";
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     print "volume.type DERIVE\n";
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     print "volume.min 0\n";