Strings Processor Plugin
This plugin allows to manipulate strings in the measurement name, tag and field values using different functions.
Introduced in: Telegraf v1.8.0 Tags: transformation OS support: all
Global configuration options
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 for more details.
Configuration
# Perform string processing on tags, fields, and measurements
[[processors.strings]]
## Convert a field value to lowercase and store in a new field
# [[processors.strings.lowercase]]
# field = "uri_stem"
# dest = "uri_stem_normalised"
## Convert a tag value to uppercase
# [[processors.strings.uppercase]]
# tag = "method"
## Convert a field value to titlecase
# [[processors.strings.titlecase]]
# field = "status"
## Trim leading and trailing whitespace using the default cutset
# [[processors.strings.trim]]
# field = "message"
## Trim leading characters in cutset
# [[processors.strings.trim_left]]
# field = "message"
# cutset = "\t"
## Trim trailing characters in cutset
# [[processors.strings.trim_right]]
# field = "message"
# cutset = "\r\n"
## Trim the given prefix from the field
# [[processors.strings.trim_prefix]]
# field = "my_value"
# prefix = "my_"
## Trim the given suffix from the field
# [[processors.strings.trim_suffix]]
# field = "read_count"
# suffix = "_count"
## Replace all non-overlapping instances of old with new
# [[processors.strings.replace]]
# measurement = "*"
# old = ":"
# new = "_"
## Trims strings based on width
# [[processors.strings.left]]
# field = "message"
# width = 10
## Decode a base64 encoded utf-8 string
# [[processors.strings.base64decode]]
# field = "message"
## Sanitize a string to ensure it is a valid utf-8 string
## Each run of invalid UTF-8 byte sequences is replaced by the replacement string, which may be empty
# [[processors.strings.valid_utf8]]
# field = "message"
# replacement = ""Values can be modified using the listed function in-place or stored in another field or tag.
The operations are executed in the configuration order.
Specify the measurement, tag, tag_key, field, or field_key you want to
processed in each section and optionally a dest if you want the result stored
in a new tag or field. You can specify lots of transformations on data with a
single strings processor.
If you’d like to apply the change to every tag, tag_key, field,
field_key, or measurement, use the value "*" for each respective field.
The dest setting will be ignored if "*" is used.
Trim, TrimLeft, TrimRight
The trim, trim_left, and trim_right functions take an optional parameter:
cutset. This value is a string containing the characters to remove from the
value.
TrimPrefix, TrimSuffix
The trim_prefix and trim_suffix functions remote the given prefix or
suffix respectively from the string.
Replace
The replace function does a substring replacement across the entire string to
allow for different conventions between various input and output plugins. Some
example usages are eliminating disallowed characters in field names or replacing
separators between different separators. Can also be used to eliminate unneeded
chars that were in metrics. If the entire name would be deleted, it will refuse
to perform the operation and keep the old name.
Example
A sample configuration:
[[processors.strings]]
[[processors.strings.lowercase]]
tag = "uri_stem"
[[processors.strings.trim_prefix]]
tag = "uri_stem"
prefix = "/api/"
[[processors.strings.uppercase]]
field = "cs-host"
dest = "cs-host_normalised"Sample input:
iis_log,method=get,uri_stem=/API/HealthCheck cs-host="MIXEDCASE_host",http_version=1.1 1519652321000000000Sample output:
iis_log,method=get,uri_stem=healthcheck cs-host="MIXEDCASE_host",http_version=1.1,cs-host_normalised="MIXEDCASE_HOST" 1519652321000000000Second Example
A sample configuration:
[[processors.strings]]
[[processors.strings.lowercase]]
tag_key = "URI-Stem"
[[processors.strings.replace]]
tag_key = "uri-stem"
old = "-"
new = "_"Sample input:
iis_log,URI-Stem=/API/HealthCheck http_version=1.1 1519652321000000000Sample output:
iis_log,uri_stem=/API/HealthCheck http_version=1.1 1519652321000000000Was this page helpful?
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