README
¶
Action plugins
add_file_name
It adds a field containing the file name to the event. It is only applicable for input plugins k8s and file.
add_host
It adds field containing hostname to an event.
convert_date
It converts field date/time data to different format.
convert_log_level
It converts the log level field according RFC-5424.
convert_utf8_bytes
It converts multiple UTF-8-encoded bytes to corresponding characters.
Supports unicode (\u... and \U...), hex (\x...) and octal (\{0-3}{0-7}{0-7}) encoded bytes.
Note: Escaped and unescaped backslashes are treated the same. For example, the following 2 values will be converted to the same result:
\x68\x65\x6C\x6C\x6Fand\\x68\\x65\\x6C\\x6C\\x6F=>hello
Examples
pipelines:
example_pipeline:
...
actions:
- type: convert_utf8_bytes
fields:
- obj.field
...
The original event:
{
"obj": {
"field": "\\xD0\\xA1\\xD0\\x98\\xD0\\xA1\\xD0\\xA2\\xD0\\x95\\xD0\\x9C\\xD0\\x90.xml"
}
}
The resulting event:
{
"obj": {
"field": "СИСТЕМА.xml"
}
}
The original event:
{
"obj": {
"field": "$\\110\\145\\154\\154\\157\\054\\040\\146\\151\\154\\145\\056\\144!"
}
}
The resulting event:
{
"obj": {
"field": "$Hello, file.d!"
}
}
The original event:
{
"obj": {
"field": "$\\u0048\\u0065\\u006C\\u006C\\u006F\\u002C\\u0020\\ud801\\udc01!"
}
}
The resulting event:
{
"obj": {
"field": "$Hello, 𐐁!"
}
}
The original event:
{
"obj": {
"field": "{\"Dir\":\"C:\\\\Users\\\\username\\\\.prog\\\\120.67.0\\\\x86_64\\\\x64\",\"File\":\"$Storage$\\xD0\\x9F\\xD1\\x80\\xD0\\xB8\\xD0\\xB7\\xD0\\xBD\\xD0\\xB0\\xD0\\xBA.20.tbl.xml\"}"
}
}
The resulting event:
{
"obj": {
"field": "{\"Dir\":\"C:\\\\Users\\\\username\\\\.prog\\\\120.67.0\\\\x86_64\\\\x64\",\"File\":\"$Storage$Признак.20.tbl.xml\"}"
}
}
debug
It logs event to stderr. Useful for debugging.
It may sample by logging the first N entries each tick.
If more events are seen during the same interval,
every thereafter message is logged and the rest are dropped.
For example,
- type: debug
interval: 1s
first: 10
thereafter: 5
This will log the first 10 events in a one second interval as-is. Following that, it will allow through every 5th event in that interval.
discard
It drops an event. It is used in a combination with match_fields/match_mode parameters to filter out the events.
An example for discarding informational and debug logs:
pipelines:
example_pipeline:
...
actions:
- type: discard
match_fields:
level: /info|debug/
...
flatten
It extracts the object keys and adds them into the root with some prefix. If the provided field isn't an object, an event will be skipped.
Example:
pipelines:
example_pipeline:
...
actions:
- type: flatten
field: animal
prefix: pet_
...
It transforms {"animal":{"type":"cat","paws":4}} into {"pet_type":"b","pet_paws":"4"}.
join
It makes one big event from the sequence of the events. It is useful for assembling back together "exceptions" or "panics" if they were written line by line. Also known as "multiline".
⚠ Parsing the whole event flow could be very CPU intensive because the plugin uses regular expressions. Consider
match_fieldsparameter to process only particular events. Check out an example for details.
Example of joining Go panics:
pipelines:
example_pipeline:
...
actions:
- type: join
field: log
start: '/^(panic:)|(http: panic serving)/'
continue: '/(^\s*$)|(goroutine [0-9]+ \[)|(\([0-9]+x[0-9,a-f]+)|(\.go:[0-9]+ \+[0-9]x)|(\/.*\.go:[0-9]+)|(\(...\))|(main\.main\(\))|(created by .*\/.*\.)|(^\[signal)|(panic.+[0-9]x[0-9,a-f]+)|(panic:)/'
match_fields:
stream: stderr // apply only for events which was written to stderr to save CPU time
...
join_template
Alias to "join" plugin with predefined start and continue parameters.
⚠ Parsing the whole event flow could be very CPU intensive because the plugin uses regular expressions. Consider
match_fieldsparameter to process only particular events. Check out an example for details.
Example of joining Go panics:
pipelines:
example_pipeline:
...
actions:
- type: join_template
template: go_panic
field: log
match_fields:
stream: stderr // apply only for events which was written to stderr to save CPU time
...
json_decode
It decodes a JSON string from the event field and merges the result with the event root. If the decoded JSON isn't an object, the event will be skipped.
json_encode
It replaces field with its JSON string representation.
Example:
pipelines:
example_pipeline:
...
actions:
- type: json_encode
field: server
...
It transforms {"server":{"os":"linux","arch":"amd64"}} into {"server":"{\"os\":\"linux\",\"arch\":\"amd64\"}"}.
json_extract
It extracts a field from JSON-encoded event field and adds extracted field to the event root.
If extracted field already exists in the event root, it will be overridden.
keep_fields
It keeps the list of the event fields and removes others.
mask
Mask plugin matches event with regular expression and substitutions successfully matched symbols via asterix symbol. You could set regular expressions and submatch groups.
Example:
pipelines:
example_pipeline:
...
actions:
- type: mask
metric_subsystem_name: "some_name"
ignore_fields:
- trace_id
masks:
- mask:
re: "\b(\d{1,4})\D?(\d{1,4})\D?(\d{1,4})\D?(\d{1,4})\b"
groups: [1,2,3]
...
modify
It modifies the content for a field or add new field. It works only with strings.
You can provide an unlimited number of config parameters. Each parameter handled as cfg.FieldSelector:cfg.Substitution.
Note: When used to add new nested fields, each child field is added step by step, which can cause performance issues.
Example:
pipelines:
example_pipeline:
...
actions:
- type: modify
my_object.field.subfield: value is ${another_object.value}.
...
The resulting event could look like:
{
"my_object": {
"field": {
"subfield":"value is 666."
}
},
"another_object": {
"value": 666
}
Filters
Sometimes it is required to extract certain data from fields and for that purpose filter chains were added. Filters are added one after another using pipe '|' symbol and they are applied to the last value in the chain.
For example, in expression ${field|re("(test-pod-\w+)",-1,[1],",")|re("test-pod-(\w+)",-1,[1],",")} first the value of 'field' is retrieved,
then the data extracted using first regular expression and formed into a new string, then the second regular expression is applied
and its result is formed into a value to be put in modified field.
Currently available filters are:
-
regex filter-re(regex string, limit int, groups []int, separator string), filters data usingregex, extractslimitoccurrences, takes regex groups listed ingroupslist, and if there are more than one extracted element concatenates result usingseparator. Negative value oflimitmeans all occurrences are extracted,limit0 means no occurrences are extracted,limitgreater than 0 means at mostlimitoccurrences are extracted. -
trim filter-trim(mode string, cutset string), trims data by thecutsetsubstring. Available modes areall- trim both sides,left- trim only left,right- trim only right.
Examples:
Example #1:
Data: {"message:"info: something happened"}
Substitution: level: ${message|re("(\w+):.*",-1,[1],",")}
Result: {"message:"info: something happened","level":"info"}
Example #2:
Data: {"message:"re1 re2 re3 re4"}
Substitution: extracted: ${message|re("(re\d+)",2,[1],",")}
Result: {"message:"re1 re2 re3 re4","extracted":"re1,re2"}
Example #3:
Data: {"message:"service=service-test-1 exec took 200ms"}
Substitution: took: ${message|re("service=([A-Za-z0-9_\-]+) exec took (\d+\.?\d*(?:ms|s|m|h))",-1,[2],",")}
Result: {"message:"service=service-test-1 exec took 200ms","took":"200ms"}
Example #4:
Data: {"message:"{\"service\":\"service-test-1\",\"took\":\"200ms\"}\n"}
Substitution: message: ${message|trim("right","\n")}
Result: {"message:"{\"service\":\"service-test-1\",\"took\":\"200ms\"}"}
move
It moves fields to the target field in a certain mode.
In
allowmode, the specifiedfieldswill be moved; inblockmode, the unspecifiedfieldswill be moved.
Examples
pipelines:
example_pipeline:
...
actions:
- type: move
mode: allow
target: other
fields:
- log.stream
- zone
...
The original event:
{
"service": "test",
"log": {
"level": "error",
"message": "error occurred",
"ts": "2023-10-30T13:35:33.638720813Z",
"stream": "stderr"
},
"zone": "z501"
}
The resulting event:
{
"service": "test",
"log": {
"level": "error",
"message": "error occurred",
"ts": "2023-10-30T13:35:33.638720813Z"
},
"other": {
"stream": "stderr",
"zone": "z501"
}
}
pipelines:
example_pipeline:
...
actions:
- type: move
mode: block
target: other
fields:
- log
...
The original event:
{
"service": "test",
"log": {
"level": "error",
"message": "error occurred",
"ts": "2023-10-30T13:35:33.638720813Z",
"stream": "stderr"
},
"zone": "z501",
"other": {
"user": "ivanivanov"
}
}
The resulting event:
{
"log": {
"level": "error",
"message": "error occurred",
"ts": "2023-10-30T13:35:33.638720813Z"
},
"other": {
"user": "ivanivanov",
"service": "test",
"zone": "z501"
}
}
parse_es
It parses HTTP input using Elasticsearch /_bulk API format. It converts sources defining create/index actions to the events. Update/delete actions are ignored.
Check out the details in Elastic Bulk API.
parse_re2
It parses string from the event field using re2 expression with named subgroups and merges the result with the event root.
remove_fields
It removes the list of the event fields and keeps others.
rename
It renames the fields of the event. You can provide an unlimited number of config parameters. Each parameter handled as cfg.FieldSelector:string.
When override is set to false, the field won't be renamed in the case of field name collision.
Sequence of rename operations isn't guaranteed. Use different actions for prioritization.
Example:
pipelines:
example_pipeline:
...
actions:
- type: rename
override: false
my_object.field.subfield: new_sub_field
...
The resulting event could look like:
{
"my_object": {
"field": {
"new_sub_field":"value"
}
},
set_time
It adds time field to the event.
split
It splits array of objects into different events.
For example:
{
"data": [
{ "message": "go" },
{ "message": "rust" },
{ "message": "c++" }
]
}
Split produces:
{ "message": "go" },
{ "message": "rust" },
{ "message": "c++" }
Parent event will be discarded. If the value of the JSON field is not an array of objects, then the event will be pass unchanged.
throttle
It discards the events if pipeline throughput gets higher than a configured threshold.
More details...
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