Adding upstream version 1.34.4.

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

docs/developers/DEBUG.md

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+# Debug
+
+The following describes how to use the [delve][1] debugger with telegraf
+during development. Delve has many, very well documented [subcommands][2] and
+options.
+
+[1]: https://github.com/go-delve/delve
+[2]: https://github.com/go-delve/delve/blob/master/Documentation/usage/README.md
+
+## CLI
+
+To run telegraf manually, users can run:
+
+```bash
+go run ./cmd/telegraf --config config.toml
+```
+
+To attach delve with a similar config users can run the following. Note the
+additional `--` to specify flags passed to telegraf. Additional flags need to
+go after this double dash:
+
+```bash
+$ dlv debug ./cmd/telegraf -- --config config.toml
+Type 'help' for list of commands.
+(dlv)
+```
+
+At this point a user could set breakpoints and continue execution.
+
+## Visual Studio Code
+
+Visual Studio Code's [go language extension][20] includes the ability to easily
+make use of [delve for debugging][21]. Check out this [full tutorial][22] from
+the go extension's wiki.
+
+A basic config is all that is required along with additional arguments to tell
+Telegraf where the config is located:
+
+```json
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch Package",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${fileDirname}",
+            "args": ["--config", "/path/to/config"]
+        }
+    ]
+}
+```
+
+[20]: https://code.visualstudio.com/docs/languages/go
+[21]: https://code.visualstudio.com/docs/languages/go#_debugging
+[22]: https://github.com/golang/vscode-go/wiki/debugging
+
+## GoLand
+
+JetBrains' [GoLand][30] also includes full featured [debugging][31] options.
+
+The following is an example debug config to run Telegraf with a config:
+
+```xml
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="build &amp; run" type="GoApplicationRunConfiguration" factoryName="Go Application">
+    <module name="telegraf" />
+    <working_directory value="$PROJECT_DIR$" />
+    <parameters value="--config telegraf.conf" />
+    <kind value="DIRECTORY" />
+    <package value="github.com/influxdata/telegraf" />
+    <directory value="$PROJECT_DIR$/cmd/telegraf" />
+    <filePath value="$PROJECT_DIR$" />
+    <method v="2" />
+  </configuration>
+</component>
+```
+
+[30]: https://www.jetbrains.com/go/
+[31]: https://www.jetbrains.com/help/go/debugging-code.html