update sample.conf

etc/sample.conf

 # Sample configuration for the varnish log tracking reader
+# This sample shows the default values
+
+# PID file for the management process
 pid.file = /var/run/trackrdrd.pid
-maxdata.scale = 2
-maxopen.scale = 3
-monitor.interval = 10
-nworkers = 20
-mq.uri = tcp://localhost:61616?wireFormat.maxInactivityDuration=0
-mq.qname = tracking
+
+# Varnish instance name, as used in the -n CLI option for varnishd
+# and other Varnish binaries
+# The config may specify only one of varnish.name, varnish.file or
+# varnish.bindump
+varnish.name = $( hostname )
+
+# Varnish VSM file -- full path of the file mmap'd to shared memory,
+# as used in the -N CLI option for Varnish binaries
+# varnish.file = $VARNISH_INSTALL/var/$INSTANCE_NAME/_.vsm
+
+# Binary log dump obtained from 'varnishlog -B -w'
+# varnish.bindump = /path/to/dump.file
+
+# Log file, used instead of syslog if specified
+# Only one of log.file or syslog.facility may be used
+# log.file = /path/to/log.file
+
+# Facility name for syslog(3), may be 'user' or 'local0' through
+# 'local7'
+syslog.facility = local0
+
+# Owner of the child process
+user = nobody
+
+# How often the management process restarts the worker process after
+# abnormal termination
+restarts = 1
+
+# Pause in seconds between restarts of the worker process
+restart.pause = 1
+
+# Interval in seconds at which the monitoring thread emits statistics
+# to the log
+monitor.interval = 30
+
+# Shared object implementing the MQ interface, may be the full path to
+# the so file, or the SO name, provided it can be found according to
+# the rules in ld.so(8)
+# There is no default, this parameter MUST be specified
+mq.module = mq-impl.so
+
+# Configuration file for the MQ implementation, if required
+# mq.config_file = /path/to/config.file
+
+# Maximum number of completed messages to be buffered for forwarding
+# to message brokers by the worker threads
+max.records = 1024
+
+# Maximum length of a message in bytes
+max.reclen = 1024
+
+# Size in bytes of fixed-length buffers in which buffered messages are
+# stored.  May not be less than 64
+# See 'DATA BUFFERS' in trackrdrd(3) for considerations on setting
+# the buffer size
+chunk.size = 256
+
+# Maximum length in bytes of sharding keys (if required by the MQ
+# implementation)
+maxkeylen = 128
+
+# Time in seconds (with subsecond precision) for the reader thread
+# to pause when it encounters the end of the Varnish log.
+# See CONFIGURATION in trackrdrd(3) for considerations on setting
+# this parameter.
+idle.pause = 0.01
+
+# Limit for the number of concurrent incomplete transactions
+# aggregated by the Varnish log API, as used in the CLI option
+# -L for varnishlog(3) and other Varnish logging tools
+tx.limit = 1000
+
+# Timeout in seconds for incomplete transactions aggregated by the
+# logging API, as used in the option -T for Varnish logging tools
+tx.timeout = 120
+
+# Number of worker threads
+nworkers = 1
+
+# How often worker threads are restarted after unrecoverable message
+# send failures
+thread.restarts = 1
+
+# Goal length for the internal queue from the reader thread to the
+# worker threads. This affects the decision to wake worker threads
+# to handle increasing loads.
+qlen.goal = 512