collectd.conf

# vim: filetype=config
Hostname              "i09"
FQDNLookup            false
AutoLoadPlugin        false
CollectInternalStats  true
Interval              10
ReadThreads           10
WriteThreads          10

LoadPlugin uptime
LoadPlugin curl
LoadPlugin threshold

LoadPlugin logfile
<Plugin logfile>
    LogLevel        info
    File            STDERR
    Timestamp       true
    PrintSeverity   true
</Plugin>

################################################################################
<Plugin curl>
  <Page "couchdb_c01">
    URL "http://c01.skunkwerks.at:5984/_up"
    Timeout 500
    MeasureResponseCode true
  </Page>
  <Page "couchdb_c02">
    URL "http://c02.skunkwerks.at:5984/_up"
    Timeout 500
    MeasureResponseCode true
  </Page>
  <Page "couchdb_c03">
    URL "http://c03.skunkwerks.at:5984/_up"
    Timeout 500
    MeasureResponseCode true
  </Page>
</Plugin>

# Load required matches:
# LoadPlugin match_empty_counter
# LoadPlugin match_hashed
# LoadPlugin match_regex
# LoadPlugin match_value
# LoadPlugin match_timediff

LoadPlugin target_notification
LoadPlugin threshold
<Plugin "threshold">
  <Plugin "curl">
  Instance "couchdb_c01"
    <Type "response_code">
      FailureMin    200
      FailureMax    299
      Persist       true
      PersistOK     true
    </Type>
  Instance "couchdb_c02"
    <Type "response_code">
      FailureMin    200
      FailureMax    299
      Persist       true
      PersistOK     true
    </Type>
  Instance "couchdb_c03"
    <Type "response_code">
      FailureMin    200
      FailureMax    299
      Persist       true
      PersistOK     true
    </Type>
  </Plugin>
</Plugin>

collectd.log

option = Hostname; value = i09;
option = FQDNLookup; value = false;
option = AutoLoadPlugin; value = false;
option = CollectInternalStats; value = true;
option = Interval; value = 10.000000;
option = ReadThreads; value = 10.000000;
option = WriteThreads; value = 10.000000;
Created new plugin context.
plugin_load: plugin "uptime" successfully loaded.
plugin_load: plugin "curl" successfully loaded.
plugin_load: plugin "threshold" successfully loaded.
[2019-01-20 12:06:51] plugin_load: plugin "logfile" successfully loaded.
[2019-01-20 12:06:51] type = logfile, key = LogLevel, value = info
[2019-01-20 12:06:51] [info] plugin_load: plugin "target_notification" successfully loaded.
[2019-01-20 12:06:51] [info] Initialization complete, entering read-loop.
[2019-01-20 12:06:52] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c01, type = response_code, message = Host i09, plugin curl (instance couchdb_c01) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:06:52] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c02, type = response_code, message = Host i09, plugin curl (instance couchdb_c02) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:06:52] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c03, type = response_code, message = Host i09, plugin curl (instance couchdb_c03) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:02] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c01, type = response_code, message = Host i09, plugin curl (instance couchdb_c01) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:02] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c02, type = response_code, message = Host i09, plugin curl (instance couchdb_c02) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:02] [error] curl plugin: curl_easy_perform failed with status 28: Connection timed out after 512 milliseconds
[2019-01-20 12:07:11] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c01, type = response_code, message = Host i09, plugin curl (instance couchdb_c01) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:12] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c02, type = response_code, message = Host i09, plugin curl (instance couchdb_c02) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:12] [error] curl plugin: curl_easy_perform failed with status 28: Connection timed out after 515 milliseconds
[2019-01-20 12:07:21] [info] Notification: severity = FAILURE, host = i09, plugin = curl, plugin_instance = couchdb_c03, type = response_code, message = i09/curl-couchdb_c03/response_code has not been updated for 29.474 seconds.
[2019-01-20 12:07:21] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c01, type = response_code, message = Host i09, plugin curl (instance couchdb_c01) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:22] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c02, type = response_code, message = Host i09, plugin curl (instance couchdb_c02) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:22] [error] curl plugin: curl_easy_perform failed with status 28: Connection timed out after 519 milliseconds
[2019-01-20 12:07:31] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c01, type = response_code, message = Host i09, plugin curl (instance couchdb_c01) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:32] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c02, type = response_code, message = Host i09, plugin curl (instance couchdb_c02) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:32] [error] curl plugin: curl_easy_perform failed with status 28: Connection timed out after 528 milliseconds
[2019-01-20 12:07:41] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c01, type = response_code, message = Host i09, plugin curl (instance couchdb_c01) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:42] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c02, type = response_code, message = Host i09, plugin curl (instance couchdb_c02) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:42] [error] curl plugin: curl_easy_perform failed with status 28: Connection timed out after 513 milliseconds
[2019-01-20 12:07:51] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c01, type = response_code, message = Host i09, plugin curl (instance couchdb_c01) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:52] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c02, type = response_code, message = Host i09, plugin curl (instance couchdb_c02) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:07:52] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c03, type = response_code, message = Host i09, plugin curl (instance couchdb_c03) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:08:02] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c01, type = response_code, message = Host i09, plugin curl (instance couchdb_c01) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:08:02] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c02, type = response_code, message = Host i09, plugin curl (instance couchdb_c02) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
[2019-01-20 12:08:02] [info] Notification: severity = OKAY, host = i09, plugin = curl, plugin_instance = couchdb_c03, type = response_code, message = Host i09, plugin curl (instance couchdb_c03) type response_code: All data sources are within range again. Current value of "value" is 200.000000.
^C[2019-01-20 12:08:02] [info] Exiting normally.
[2019-01-20 12:08:02] [info] collectd: Stopping 10 read threads.
[2019-01-20 12:08:02] [info] collectd: Stopping 10 write threads.