Add minimum version for new plugins (#7810)

plugins/inputs/nginx_sts/README.md

@@ -7,6 +7,8 @@ status such as servers, upstreams, caches. This is similar to the live activity
 monitoring of Nginx plus.  For module configuration details please see its
 [documentation](https://github.com/vozlt/nginx-module-sts#synopsis).
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration
 
 ```toml

plugins/inputs/redfish/README.md

@@ -2,6 +2,7 @@
 
 The `redfish` plugin gathers  metrics and status information about CPU temperature, fanspeed, Powersupply, voltage, hostname and Location details(datacenter,placement,rack and room) of hardware servers for which redfish is enabled.
 
+Telegraf minimum version: Telegraf 1.15.0
 
 ### Configuration
 

plugins/outputs/execd/README.md

@@ -2,6 +2,8 @@
 
 The `execd` plugin runs an external program as a daemon.
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration:
 
 ```toml

plugins/outputs/newrelic/README.md

@@ -4,6 +4,8 @@ This plugins writes to New Relic Insights using the [Metrics API][].
 
 To use this plugin you must first obtain an [Insights API Key][].
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration
 ```toml
 [[outputs.newrelic]]

plugins/processors/defaults/README.md

@@ -8,6 +8,8 @@ There are three cases where this processor will insert a configured default fiel
 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
+
 ### Configuration
 ```toml
 ## Set default fields on your metric(s) when they are nil or empty

plugins/processors/execd/README.md

@@ -7,6 +7,8 @@ metrics in influx line protocol to standard output (STDOUT).
 
 Program output on standard error is mirrored to the telegraf log.
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Caveats
 
 - Metrics with tracking will be considered "delivered" as soon as they are passed

plugins/processors/filepath/README.md

@@ -22,7 +22,9 @@ stored in a new tag or field.
 
 If you plan to apply multiple transformations to the same `tag`/`field`, bear in mind the processing order stated above.
 
-## Configuration
+Telegraf minimum version: Telegraf 1.15.0
+
+### Configuration
 
 ```toml
 [[processors.filepath]]
@@ -56,9 +58,9 @@ If you plan to apply multiple transformations to the same `tag`/`field`, bear in
   #   tag = "path"
 ```
 
-## Considerations
+### Considerations
 
-### Clean
+#### Clean
 
 Even though `clean` is provided a standalone function, it is also invoked when using the `rel` and `dirname` functions,
 so there is no need to use it along with them.
@@ -81,13 +83,13 @@ Is equivalent to:
      tag = "path"
  ```
 
-### ToSlash
+#### ToSlash
 
 The effects of this function are only noticeable on Windows platforms, because of the underlying golang implementation.
 
-## Examples
+### Examples
 
-### Basename
+#### Basename
  
 ```toml
 [[processors.filepath]]
@@ -100,7 +102,7 @@ The effects of this function are only noticeable on Windows platforms, because o
 + my_metric,path="ajob.log" duration_seconds=134 1587920425000000000
 ```
 
-### Dirname
+#### Dirname
 
 ```toml
 [[processors.filepath]]
@@ -114,7 +116,7 @@ The effects of this function are only noticeable on Windows platforms, because o
 + my_metric path="/var/log/batch/ajob.log",folder="/var/log/batch",duration_seconds=134 1587920425000000000
 ```
 
-### Stem
+#### Stem
 
 ```toml
 [[processors.filepath]]
@@ -127,7 +129,7 @@ The effects of this function are only noticeable on Windows platforms, because o
 + my_metric,path="ajob" duration_seconds=134 1587920425000000000
 ```
 
-### Clean
+#### Clean
 
 ```toml
 [[processors.filepath]]
@@ -140,7 +142,7 @@ The effects of this function are only noticeable on Windows platforms, because o
 + my_metric,path="/var/log/batch/ajob.log" duration_seconds=134 1587920425000000000
 ```
 
-### Rel
+#### Rel
 
 ```toml
 [[processors.filepath]]
@@ -154,7 +156,7 @@ The effects of this function are only noticeable on Windows platforms, because o
 + my_metric,path="batch/ajob.log" duration_seconds=134 1587920425000000000
 ```
 
-### ToSlash
+#### ToSlash
 
 ```toml
 [[processors.filepath]]

plugins/processors/ifname/README.md

@@ -2,6 +2,8 @@
 
 The `ifname` plugin looks up network interface names using SNMP.
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration:
 
 ```toml

plugins/processors/port_name/README.md

@@ -4,6 +4,8 @@ Use the `port_name` processor to convert a tag containing a well-known port numb
 
 Tag can contain a number ("80") or number and protocol separated by slash ("443/tcp"). If protocol is not provided it defaults to tcp but can be changed with the default_protocol setting.
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration
 
 ```toml

plugins/processors/reverse_dns/README.md

@@ -3,6 +3,8 @@
 The `reverse_dns` processor does a reverse-dns lookup on tags (or fields) with
 IPs in them.
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration:
 
 ```toml

plugins/processors/starlark/README.md

@@ -13,6 +13,8 @@ files or sockets.
 The Starlark [specification][] has details about the syntax and available
 functions.
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration
 
 ```toml