How can I tell Logstash's buffer size?

I set a buffer_size in my input plugin, and see in the logs that the value is actually being set.

input {
  udp {
    port => 5555
    buffer_size = 65536

However, how can I really tell that Logstash is indeed using the value?

I'm debugging a log where I get a _jsonparsefailure. But if I delete a dozen lines from the file, Logstash parses it ok, so I'm guessing this is a buffer overrun issue?

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