'Varnish has default limits for cache contents(URL + query string)'s length?

In the varnish log with varnishncsa, I found that the URL + query string parts seems truncated, like:

$ sudo varnishncsa -F "%U%q" | awk '{print $0,length}' > uq.vlen
(... few hours later within a host has a lot of traffics)
$ cat uq.vlen | sort -srn -k 2 | head -10
/<opaque_path>?<opaque_long_query_strings> 254
/<opaque_path>?<opaque_long_query_strings> 254
/<opaque_path>?<opaque_long_query_strings> 254
/<opaque_path>?<opaque_long_query_strings> 254
/<opaque_path>?<opaque_long_query_strings> 254
/<opaque_path>?<opaque_long_query_strings> 254
/<opaque_path>?<opaque_long_query_strings> 254
/<opaque_path>?<opaque_long_query_strings> 254
/<opaque_path>?<opaque_long_query_strings> 254
/<opaque_path>?<opaque_long_query_strings> 254
...

Is there a limit on URL + query string's length of varnish content?(default as 254?) Cannot find on documentations or in my vcl file(vcl 4.0) on that.

varnishvarnish-vcl


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