telegraf: [inputs.opcua] Error in plugin: RegisterNodes Read failed: The operation timed out. StatusBadTimeout (0x800A0000)

Relevant telegraf.conf:

# Telegraf Configuration
#
# Telegraf is entirely plugin driven. All metrics are gathered from the
# declared inputs, and sent to the declared outputs.
#
# Plugins must be declared in here to be active.
# To deactivate a plugin, comment out the name and any variables.
#
# Use 'telegraf -config telegraf.conf -test' to see what metrics a config
# file would generate.
#
# Environment variables can be used anywhere in this config file, simply surround
# them with ${}. For strings the variable must be within quotes (ie, "${STR_VAR}"),
# for numbers and booleans they should be plain (ie, ${INT_VAR}, ${BOOL_VAR})


# Global tags can be specified here in key="value" format.
[global_tags]
  # dc = "us-east-1" # will tag all metrics with dc=us-east-1
  # rack = "1a"
  ## Environment variables can be used as tags, and throughout the config file
  # user = "$USER"


# Configuration for telegraf agent
[agent]
  ## Default data collection interval for all inputs
  interval = "10s"
  ## Rounds collection interval to 'interval'
  ## ie, if interval="10s" then always collect on :00, :10, :20, etc.
  round_interval = true

  ## Telegraf will send metrics to outputs in batches of at most
  ## metric_batch_size metrics.
  ## This controls the size of writes that Telegraf sends to output plugins.
  metric_batch_size = 1000

  ## Maximum number of unwritten metrics per output.  Increasing this value
  ## allows for longer periods of output downtime without dropping metrics at the
  ## cost of higher maximum memory usage.
  metric_buffer_limit = 10000

  ## Collection jitter is used to jitter the collection by a random amount.
  ## Each plugin will sleep for a random time within jitter before collecting.
  ## This can be used to avoid many plugins querying things like sysfs at the
  ## same time, which can have a measurable effect on the system.
  collection_jitter = "0s"

  ## Default flushing interval for all outputs. Maximum flush_interval will be
  ## flush_interval + flush_jitter
  flush_interval = "10s"
  ## Jitter the flush interval by a random amount. This is primarily to avoid
  ## large write spikes for users running a large number of telegraf instances.
  ## ie, a jitter of 5s and interval 10s means flushes will happen every 10-15s
  flush_jitter = "0s"

  ## By default or when set to "0s", precision will be set to the same
  ## timestamp order as the collection interval, with the maximum being 1s.
  ##   ie, when interval = "10s", precision will be "1s"
  ##       when interval = "250ms", precision will be "1ms"
  ## Precision will NOT be used for service inputs. It is up to each individual
  ## service input to set the timestamp at the appropriate precision.
  ## Valid time units are "ns", "us" (or "µs"), "ms", "s".
  precision = ""

  ## Log at debug level.
  # debug = false
  ## Log only error level messages.
  # quiet = false

  ## Log target controls the destination for logs and can be one of "file",
  ## "stderr" or, on Windows, "eventlog".  When set to "file", the output file
  ## is determined by the "logfile" setting.
  logtarget = "file"

  ## Name of the file to be logged to when using the "file" logtarget.  If set to
  ## the empty string then logs are written to stderr.
  logfile = "telegraf.log"

  ## The logfile will be rotated after the time interval specified.  When set
  ## to 0 no time based rotation is performed.  Logs are rotated only when
  ## written to, if there is no log activity rotation may be delayed.
  # logfile_rotation_interval = "0d"

  ## The logfile will be rotated when it becomes larger than the specified
  ## size.  When set to 0 no size based rotation is performed.
  logfile_rotation_max_size = "5MB"

  ## Maximum number of rotated archives to keep, any older logs are deleted.
  ## If set to -1, no archives are removed.
  logfile_rotation_max_archives = 5

  ## Override default hostname, if empty use os.Hostname()
  hostname = ""
  ## If set to true, do no set the "host" tag in the telegraf agent.
  omit_hostname = false

System info:

Telegraf 1.7 running as windows service in Windows Server 2016

Steps to reproduce:

Create more than 100 variables using OPC UA server Kepware. Try to read all of them at 10s trigger. In OPC UA input plugin configure maximum time allowed for a request over the estabilished connection. request_timeout = “5s”

Expected behavior:

Data capture every 10s without errors.

Actual behavior:

Timeout error. Data is captured in a random amount of time. Sometimes 10s, sometimes more.

Additional info:

2021-02-19T19:28:10Z W! [inputs.opcua] Collection took longer than expected; not complete after interval of 10s 2021-02-19T19:28:10Z E! [inputs.opcua] Error in plugin: RegisterNodes Read failed: The operation timed out. StatusBadTimeout (0x800A0000) 2021-02-19T19:28:40Z W! [inputs.opcua] Collection took longer than expected; not complete after interval of 10s 2021-02-19T19:28:40Z E! [inputs.opcua] Error in plugin: RegisterNodes Read failed: The operation timed out. StatusBadTimeout (0x800A0000) 2021-02-19T19:28:55Z E! [inputs.opcua] Error in plugin: Get Data Failed: RegisterNodes Read failed: The operation timed out. StatusBadTimeout (0x800A0000) 2021-02-19T19:29:05Z E! [inputs.opcua] Error in plugin: Get Data Failed: RegisterNodes Read failed: The operation timed out. StatusBadTimeout (0x800A0000) 2021-02-19T19:29:15Z E! [inputs.opcua] Error in plugin: Get Data Failed: RegisterNodes Read failed: The operation timed out. StatusBadTimeout (0x800A0000) 2021-02-19T19:29:30Z W! [inputs.opcua] Collection took longer than expected; not complete after interval of 10s 2021-02-19T19:29:30Z E! [inputs.opcua] Error in plugin: RegisterNodes Read failed: The operation timed out. StatusBadTimeout (0x800A0000) 2021-02-19T19:29:45Z E! [inputs.opcua] Error in plugin: Get Data Failed: RegisterNodes Read failed: The operation timed out. StatusBadTimeout (0x800A0000) 2021-02-19T19:30:00Z W! [inputs.opcua] Collection took longer than expected; not complete after interval of 10s 2021-02-19T19:30:20Z W! [inputs.opcua] Collection took longer than expected; not complete after interval of 10s 2021-02-19T19:30:20Z E! [inputs.opcua] Error in plugin: RegisterNodes Read failed: The operation timed out. StatusBadTimeout (0x800A0000) 2021-02-19T19:30:35Z E! [inputs.opcua] Error in plugin: Get Data Failed: RegisterNodes Read failed: The operation timed out. StatusBadTimeout (0x800A0000) 2021-02-19T19:30:45Z E! [inputs.opcua] Error in plugin: Get Data Failed: RegisterNodes Read failed: The operation timed out. StatusBadTimeout (0x800A0000)