varnishlog: add page (#8169)

pages/common/varnishlog.md

@@ -0,0 +1,24 @@
+# varnishlog
+
+> Display Varnish logs.
+> More information: <https://varnish-cache.org/docs/trunk/reference/varnishlog.html>.
+
+- Display logs in real time:
+
+`varnishlog`
+
+- Only display requests to a specific domain:
+
+`varnishlog -q 'ReqHeader eq "Host: {{example.com}}"'`
+
+- Only display POST requests:
+
+`varnishlog -q 'ReqMethod eq "{{POST}}"'`
+
+- Only display requests to a specific path:
+
+`varnishlog -q 'ReqURL eq "{{/path}}"'`
+
+- Only display requests to paths matching a regular expression:
+
+`varnishlog -q 'ReqURL ~ "{{regex}}"'`