Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/processors/defaults/README.md

@@ -0,0 +1,65 @@
+# Defaults Processor Plugin
+
+The _Defaults_ processor allows you to ensure certain fields will always exist
+with a specified default value on your metric(s).
+
+There are three cases where this processor will insert a configured default
+field.
+
+1. The field is nil on the incoming metric
+1. The field is not nil, but its value is an empty string.
+1. The field is not nil, but its value is a string of one or more empty spaces.
+
+Telegraf minimum version: Telegraf 1.15.0
+
+## Global configuration options <!-- @/docs/includes/plugin_config.md -->
+
+In addition to the plugin-specific configuration settings, plugins support
+additional global and plugin configuration settings. These settings are used to
+modify metrics, tags, and field or create aliases and configure ordering, etc.
+See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
+
+[CONFIGURATION.md]: ../../../docs/CONFIGURATION.md#plugins
+
+## Configuration
+
+```toml @sample.conf
+## Set default fields on your metric(s) when they are nil or empty
+[[processors.defaults]]
+  ## Ensures a set of fields always exists on your metric(s) with their
+  ## respective default value.
+  ## For any given field pair (key = default), if it's not set, a field
+  ## is set on the metric with the specified default.
+  ##
+  ## A field is considered not set if it is nil on the incoming metric;
+  ## or it is not nil but its value is an empty string or is a string
+  ## of one or more spaces.
+  ##   <target-field> = <value>
+  [processors.defaults.fields]
+    field_1 = "bar"
+    time_idle = 0
+    is_error = true
+```
+
+## Example
+
+Ensure a _status\_code_ field with _N/A_ is inserted in the metric when one is
+not set in the metric by default:
+
+```toml
+[[processors.defaults]]
+  [processors.defaults.fields]
+    status_code = "N/A"
+```
+
+```diff
+- lb,http_method=GET cache_status=HIT,latency=230
++ lb,http_method=GET cache_status=HIT,latency=230,status_code="N/A"
+```
+
+Ensure an empty string gets replaced by a default:
+
+```diff
+- lb,http_method=GET cache_status=HIT,latency=230,status_code=""
++ lb,http_method=GET cache_status=HIT,latency=230,status_code="N/A"
+```