Generates temporary events as part of the query and is ideal for
generating sample data for testing or troubleshooting. It is regarded as
an aggregator function and, therefore, discards all incoming events and
outputs the generated ones. The events are generated with no extracted
fields but createEvents() can, advantageously, be
combined with one of the many parsers. For example, given raw strings in
the format of key/value pairs, the pairs can be parsed to fields using the
kvParse() function.
The createEvents()
function generates temporary events as part of the query. The
function is ideal for generating sample data for testing or
troubleshooting.
Creates two temporary events to be used for testing purposes. An
event with dog and an
event with cat.
Event Result set.
Summary and Results
The query is used to create temporary events. The
createEvents() function can be combined
with different parsers to generate more interesting events, for
example, with kvParse() or
parseJson().
Sample output from the incoming example data:
@rawstring
@timestamp
@timestamp.nanos
animal=dog weight=7.0
1733310508872
0
animal=cat weight=4.2
1733310508872
0
Create Two Temporary Events for Troubleshooting - Example 2
Create two temporary events for testing or troubleshooting using the createEvents() function with parseJson()
The createEvents()
function generates temporary events as part of the query. The
function is ideal for generating sample data for testing or
troubleshooting. In this example, the
createEvents() function is combined with
parseJson() to parse
@rawstring as JSON.
The createEvents()
function generates temporary events as part of the query. The
function is ideal for generating sample data for testing or
troubleshooting. In this example, the
createEvents() function is combined with
kvParse() to parse
@rawstring as JSON.
The bitfield:extractFlags() can be used to
code an integer to its bit-representation and extract the bits
at specified indices to specified field names as a boolean. One
or multiple flags can be extracted from a bit field. The
createEvents() function generates temporary
events as part of the query and is ideal for generating sample
data for testing or troubleshooting. The events are generated
with no extracted fields but createEvents()
can, advantageously, be combined with one of the many parsers.
For example, given raw strings in the format of key/value pairs,
the pairs can be parsed to fields using the
kvParse() function.
In this example, the bit field is called flags and
has the value 4
corresponding to the bit string
00000100. The goal is to extract
two flags based on their bit value.
Step-by-Step
Starting with the source repository events.
logscale
createEvents(["flags=4"])
Creates a temporary event that includes a new field named
flag to be used for
testing purposes. Bit flags are one or more (up to 32) Boolean
values stored in a single number variable.
logscale
|kvParse()
Parses the raw text looking for the key/value pairs and creates
the corresponding fields in the event. In this case a single
field named flags with
the value 8.
When specifying the values for the bit field, values start
from bit 0 (2^0 or
decimal 1). The invidual bit values are defined using an array
of arrays. Each array index should specify the bit number (not
literal value) and the field to be created. Each field will
then be set to true if
the bit was enabled in the compared field.
In the above example,
ErrorFlag located at bit 1
(2^1, decimal 2), and WarningFlag located at
index 2 (decimal 4).
Event Result set.
Summary and Results
The query is used to extract and match values to bit flags.
Creating events based on bit flags are useful when testing and
troubleshooting on values, as it is faster to compare values
stored as bitmasks compared to a series of booleans.
Furthermore, events based on bit flags uses considerably less
memory.
Sample output from the incoming example data:
ErrorFlag
WarningFlag
false
true
Perform a Free-Text Search in Rawstring
Perform a free-text search in a rawstring using the createEvents() function
Query
logscale
createEvents(["foobar"])|@rawstring="*foo*"
Introduction
The createEvents() function generates
temporary events as part of the query and is ideal for generating
sample data for testing or troubleshooting. In this example, the
createEvents() function is used to do a
free-text search for fooin a
rawstring. The * around the
value is to ensure, that we are looking for any value in
@rawstring where
foo is in the middle with
any prefix or suffix.
Step-by-Step
Starting with the source repository events.
logscale
createEvents(["foobar"])|@rawstring="*foo*"
Free-text searches for foo
in a rawstring. Notice that you must add
* around the free text
string foo.
Event Result set.
Summary and Results
The query is used specifically to perform a free-text search in
the @rawstring field. This can be useful in
any case you may want to search a specific field name to check
for that first part.