Adding upstream version 1.34.4.

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

plugins/aggregators/merge/README.md

@@ -0,0 +1,49 @@
+# Merge Aggregator Plugin
+
+This plugin merges metrics of the same series and timestamp into new metrics
+with the super-set of fields. A series here is defined by the metric name and
+the tag key-value set.
+
+Use this plugin when fields are split over multiple metrics, with the same
+measurement, tag set and timestamp.
+
+⭐ Telegraf v1.13.0
+🏷️ transformation
+💻 all
+
+## 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
+# Merge metrics into multifield metrics by series key
+[[aggregators.merge]]
+  ## General Aggregator Arguments:
+  ## The period on which to flush & clear the aggregator.
+  # period = "30s"
+
+  ## Precision to round the metric timestamp to
+  ## This is useful for cases where metrics to merge arrive within a small
+  ## interval and thus vary in timestamp. The timestamp of the resulting metric
+  ## is also rounded.
+  # round_timestamp_to = "1ns"
+
+  ## If true, the original metric will be dropped by the
+  ## aggregator and will not get sent to the output plugins.
+  drop_original = true
+```
+
+## Example
+
+```diff
+- cpu,host=localhost usage_time=42 1567562620000000000
+- cpu,host=localhost idle_time=42 1567562620000000000
++ cpu,host=localhost idle_time=42,usage_time=42 1567562620000000000
+```