Zabbix preprocessing regular expression examples This example uses the Matches regular expression preprocessing step to filter 1 Preprocessing testing Testing. Returns null if node is not found. If Zabbix server or proxy is restarted or there is any change made to preprocessing steps, the last value of the corresponding item is reset, resulting in: 3 Preprocessing examples. Then you Well, if you take that and throw in a regex, you can make the preprocessing step. *,Information,,,,skip] matches the second line. VALUE3}} 3 Preprocessing examples. For example, you may want to extract the customer name and interface number from the following LLD macro for the purposes of event tagging: For example, it would be nice to use {HOST. HOST<1-9>} and {ITEM. Because of the ambiguity of what line feed is used (\n matches a line-feed (newline) character (ASCII 10)) and whether it is there at all. Regular expression names must not be quoted in other Zabbix regular expression engine does not use "global" or "multiline", so when testing regular expressions in online tools like "regex101. Javascript preprocessing is done by invoking JavaScript function with a single parameter 'value' and user provided function body. In Zabbix you cannot debug this very well (or I just didn't discover yet how to do it). query(data, expression) Retrieves node content using XPath. It is possible to test: against a hypothetical value; against a real value from a host 1 Usage examples Overview. Regex to get a specificpart of a text. KEY<1-9>} macros are supported inside expression macros. so the regular expression doesn't really work. Unpack the content into a separate directory inside the modules directory of your Zabbix frontend installation (for example, zabbix/ui/modules). I'm not very fluent with Regular expressions, and I'm having a hard time understanding what to put in the pattern and output fields to change incoming text. 1. Add one step, and choose Regular Expression as the Name A custom regular expression name in Zabbix may contain commas, spaces, etc. Several new options for value preprocessing have been added: Regular expression - find match by a regular expression/output template; There is an advanced editor for creating and testing complex regular expressions in Zabbix frontend. The item value preprocessing allows to define and execute transformation rules for the received item values. How can I add this capture group to my trigger name? Example: . Improve this answer. Milking a cow is far easier, even for an IT tech. In those cases where that may lead to misinterpretation when referencing (for example, a comma in the parameter of an item key) the whole reference may be put in quotes like this: "@My custom regexp for purpose1, purpose2". Zabbix Acceptance Item preprocessing rules will be internally classified as: Validation → Matches regular expression [regex]: check that value matches 'regex', 2. net/zabbix/item-preprocessing-regex/Course Coupons : https://sbcode. Over time Zabbix preprocessing evolved even further and extended the functionality in Zabbix 4. Preprocessing is managed by a preprocessing manager process, which was added in Zabbix To visualize the logic of preprocessing queue, we can use the following diagram: Values from the preprocessing queue are flushed from the beginning of the queue to the first unprocessed value. Because even grep is matching against individual lines, and could only show other lines with additional parameters like -A(num), -B(num), . JavaScript preprocessing is done by invoking JavaScript function with a single parameter 'value' and user-provided function body. RegEx capture part of text. 4 brought a feature called Item Preprocessing. To configure an item with regex: Go to Configuration > Hosts. 4. One of these is, to apply WMI, JMX, and ODBC data collection to JSON arrays enabling preprocessing via JSONPath. Something like this: QMNAME(NAME1) STATUS(Running) QMNAME(NAME2) STATUS(Running) QMNAME(NAME3) STATUS(Standby) My goal is to create 2 items for each row and extract the instance name and its 2 Trigger expression Overview. Sign up for the official Zabbix Certified Specialist course and learn how to optimize your data collection, enrich your alerts with useful information, and minimize the amount of noise and false alarms. The function returns a result that is compared to the threshold, using an operator and a constant. All calculations are done by Zabbix server only. This example uses the Matches regular expression preprocessing step to 3 Preprocessing examples Overview. The general tab has 2 lines of data. This class is designed to work with global regular expressions. The preprocessing step result is the value returned by this function, for example, to perform Fahrenheit to Celsius conversion 1 Using regular expressions. A simple expression uses a function that is applied to the item with some parameters. To configure a CSV to JSON preprocessing step: Go to the Preprocessing tab in item/discovery rule configuration; Click on Add; Select the Currently Zabbix allows only regular expression preprocessing step to extract/modify value. In Configuration > Hosts > Host > Items > Preprocessing there are two preprocessing rules: Change per second and Custom multiplier of 8 as we are receiving data as bits and need to calculate it as bytes. JavaScript preprocessing. Only the passed properties will be updated, all others will remain unchanged. This example uses the Matches regular expression preprocessing step to Zabbix 3. log file that is formatted in xml. Filtering VMware event log records. HOST} in regular expression preprocessing, but it would be nice if I could use it also in JavaScript preprocessing calling a method of a class ZabbixMacro like the following: Enqueues the items in the preprocessing queue Assigns the preprocessing tasks to preprocessing workers Flushes the preprocessed values from the queue StartPreprocessors defines the value of pre-forked preprocessing workers Number of workers determined by: Count of preprocessable items Count of preprocessing steps etc. 1 Using regular expressions. Testing preprocessing steps is useful to make sure that complex preprocessing pipelines yield the results that are expected from them, without waiting for the item value to be received and preprocessed. Here an example of what I like to accomplish: gpfs_fileset_alloc_inodes preprocessing to JSON not accepting regular expression for metric in discovery rule 26-03-2024, But the regular expression returns an error: Incorrect value for field "params": Zabbix documentation contains the list of locations supporting the usage of global regular expression. Name="Something" I want Something, so I apply the following trim pre-processing; Left Trim: MSCluster_Network. The regular expressions referred to in discovery are found under Administration->General, and then "Regular 14 Preprocessing by Javascript details. To learn about configuring basic preprocessing steps, see: Item value preprocessing. To start viewing messages, select the forum that you want to visit from the selection below. "Find & Replace" preprocessing step can help with such case. Item value preprocessing allows to define and execute transformation rules for the received item values. Using the macro in a REGULAR EXPRESSION preprocessing step works fine to produce indicated output, but using the macro as a REPLACE does not recognize the regex parameter. This section outlines the supported JSONPath functionality within item value preprocessing steps. {HOST. Here's the question: I'm monitoring a Windows Event Log and it's coming in fine, but I on;y need 3 pieces of info from it and want to create 'fields' with those pieces of information by extracting them from the log with a regex so that they can be shown in a table in Grafana later. name - name of event log regexp - regular expression describing the required pattern How to extract only a string using jsonpath in Zabbix? Ask Question Asked 1 year, 2 months ago. A custom regular expression name in Zabbix may contain commas, spaces, etc. This example uses the Matches regular expression preprocessing step to filter Examples. It would be good to extend preprocessor with the following: 1. Regular expression names must not be quoted in other For example, it would be nice to use {HOST. Back I have an interesting scenario where an item collects a text value with multiple lines. Using a regular expression preprocessing to filter unnecessary events of the VMWare event log. Except where otherwise noted, Zabbix Documentation is licensed under the following license. ['name'] return values of all name properties. I am new to regular expressions. If this is your first visit, be sure to check out the FAQ by clicking the link above. Regular expression: Match the value to the <pattern> regular expression and replace value with <output>. Regular expression names must not be quoted in other In the "Filters" tab you may add a regular expression that filters only read-write filesystems: Dependent item prototype. 2 Trigger expression Overview. 1st step regular expression select everything after word. Parameters: pattern - regular expression output - output formatting template. If it's lots of items, then using Low Level Discovery will auto-scale so that you don't have to maintain it as things change, but I'd like to use the item preprocessing to capture a certain string from a eventlog. to make this work we had to use several different Server addresses to get all the proxies to connect. The following objects are directly related to the regexp API. Case insensitive regexp 2. All regular expressions in Zabbix, whether created with the advanced editor, or entered manually, support 1 Usage examples Overview. Back to Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. This section provides files of sample modules and widgets, which you can use as a base for your custom modules. By applying regex in triggers, item configurations, and optimizing poller 3 Preprocessing examples. And when I read the MAC address i get it like 0:3:xx:xx:xx:xx i want it like 00:03:xx:xx:xx:xx. Modified 1 year, 1 month ago. You may have to REGISTER before you can post. It seems that the string is coming into Zabbix with "" around it but there appears to be an extra There is an advanced editor for creating and testing complex regular expressions in Zabbix frontend. 3 Preprocessing usage examples Overview. Matched element names can be extracted by adding a tilde (~) suffix to the JSONPath. delete. Macro functions are supported with low-level discovery macros (except in low-level discovery rule filter), allowing to extract a certain part of the macro value using a regular expression. Each row has an instance name and a status. The eventlog[Application,. Once a regular expression has been created this way, it can be used in several places in the frontend by referring to its name, prefixed with @, for example, @mycustomregexp. 3 Preprocessing examples. com and paste the complete string we received from the master item and start matching the temperatures. 1 New preprocessing options. create. When I copy and paste the trap output below into the test section under the preprocessor, the regex works. They are applied to our original items and are I'm trying to take an item coming in as a text string and use preprocessing to change it to Numeric (float). When low-level discovery macros are used in JSONPath preprocessing and their values are resolved, the following rules of escaping special characters are applied: only backslash (\) and double quote (") characters are considered for escaping; if the resolved macro value contains these characters, each of them is escaped with a backslash; The syntax in EXPRESSION is the same as in trigger expressions (see usage limitations below). My file is something like the example below. As master item for this prototype select the This is a regular expression. =is used for assignment but not for comparison. This example uses the Matches regular expression preprocessing step to So, I am trying to use the new preprocessing feature of new 3. digitalocean. New to Zabbix but picking up steam quickly. 2 Preprocessing details Overview. I'm monitoring a UPS with zabbix via SNMP. Parameters (object/array) Regular expression properties to be updated. See also: Preprocessing details; Preprocessing testing; Type; Transformation: Description: Text: Regular expression: Match the received value to the <pattern> regular expression Zabbix Acceptance Item preprocessing rules will be internally classified as: Validation → Matches regular expression [regular expression]: check that value matches 'regular expression', For example, temperature sensor returns +999C if it is off, Zabbix Acceptance. Item preprocessing rules will be internally classified as: Validation → Matches regular expression For example, temperature sensor returns +999C if it is off, normal range is -100C up-to +100C; Skip values that match some regular expression; This method is available only to Super Admin. To create a global regular expression: Go to: Administration → General I need to monitor a . As the topic says, I have been experimenting and I can't find the answer to this. Documentation : https://sbcode. Match the value to the <pattern> regular expression and replace value with <output>. : clearHeader() To find a matching segment ignoring its ancestry (detached segment), it must be prefixed with two dots (. At all it is difficult say something on regular expressions not possessing original(!) lines'. The regular expression supports extraction of maximum 10 captured groups with the \N sequence. Regular expression object. NAME}" returns which would be -1(see the below snippet). You can add a second preprocessing rule, for example a regular expression . This is for a hostname. Iron Bishop Common parameters /host/key is a common mandatory first parameter for the functions referencing the host item history (sec|#num)<:time shift> is a common second parameter for the functions referencing the host item history, where: sec - maximum evaluation period in seconds (time suffixes can be used), or; #num - maximum evaluation range in latest collected values (if 14 Preprocessing by Javascript details. *12345. Calculated items are a way of creating virtual data sources. Let’s have a look at the preprocessing methods, starting with the simpler ones. For example, temperature sensor returns +999C if it is off, normal range is 2 Preprocessing details Overview. com but not on zabbix, I'm trying to monitor an eventlog in zabbix, Guess I'll make it an answer with a python example code. The initial interface name (got from IF-MIB::ifDescr) is to long and have some useless information in the A custom regular expression name in Zabbix may contain commas, spaces, etc. If it's a single item with varying content length, a for-loop in a json preprocessor will auto-scale. com it should capture the date. 2 Regular expression types. 29 dBm. The X420 is sending a string of 0. I was trying to collect some data from a file using regular expressions and for that I was looking for an optimal solution. Hence the question, will the ZBX regex preprocessing work with multiline? Because the solution is eluding to me. Additionally to the standard properties, the method accepts the following parameters. The item is using SNMP to pull an octet string showing light level from a device, it comes out like -6. name which is the first element/object of json arrray to whatever ~"{HOST. The intent is in this example 193. () (someParms=on) ## [some comments] ## parm1=410962 parm2=205481 parm3=138871 parm4=670 parm5=6 parm6="Oct 25 16:27" parm7="Oct 25 This section provides details of preprocessing by JavaScript. This example uses the Matches regular expression preprocessing step to In general, regular expressions are not the easiest thing. If i use this Item Key: logrt["C:\temp\myfile. It's supported in: items (item prototypes) low-level discovery rules; Configuration. Item Preprocessing with Regex Item Preprocessing with Regex Table of contents Video Lecture Zabbix API Python Example Zabbix API User Permissions The regular expressions demonstrated in this video are, Regex Output Description (. Example (file monitoring): 1 Usage examples Overview. This section presents examples of using preprocessing steps to accomplish some practical tasks. Select the host and Mastering Zabbix regular The syntax in EXPRESSION is the same as in trigger expressions (see usage limitations below). 3. Name=" Right Trim:" While this example is quite a trivial, Javascript preprocessing can be used in complex things like analyzing input data, converting text data to other formats (JSON), etc. Object references: Regular expression; Zabbix Documentation is licensed under the following license. This can be used for simple as well as dependent items. Our server and most of the proxies sit in a private network. expression - an XPath expression; data - XML data as a string. In this preprocessing step it is possible to convert CSV file data into JSON format. VALUE2} - {FUNCTION. Regular expression. Register the module in Zabbix frontend. Follow answered Nov 13, 2023 at 9:05. *tnslsnr ([^ ]*) : Share. Homepage; zabbix 4 database schema; Zabbix compatibility matrix; https://www. Basically, whenever Zabbix standard preprocessing 3 Preprocessing examples Overview. ;-) - Apart from that I think, that you have to consider, that it also depends on the underlying data where the regular expression is applied to. Optional regexp: the regexp that does not make item unsupported if pattern does not match 3. Hi! Maybe it possible to use regular expressions to solve the problem but I wasn't successful in that activity. For example: This example uses the Custom multiplier preprocessing step In this lecture, I add a pre-processing step to the item that instructs the agent to read the windows failed logon events. 4 JSONPath functionality. VALUE3}}. Check out Zabbix documentation to learn how to search by metriс name (as we did in the first item I showed you), by metric name matching a regular expression, by label name, or label name Example, Garage Door Open / Garage Door Closed. Regex: task\\s+"([^"]+)" 6 CSV to JSON preprocessing Overview. A segment can take the form of a simple word, representing a JSON value name, the wildcard character ( * ), or a more intricate construct enclosed within square brackets. VALUE<1-9>} and {FUNCTION. Skip out of range values. This field is used for all following requests until cleared with the clearHeader() method. Basically all i need is to detect the word "Failed". So, for example, preprocessing manager will flush values 1, 2 and 3, but will not flush value 5 as value 4 is not processed yet: Zabbix Acceptance. If you noticed, all the services in the screenshot are also in the regular expression section. The preprocessing step result is the value returned by this function, for example, to perform Fahrenheit to Celsius conversion 2 Trigger expression Overview. 0. The regexpid property must be defined for each object, all other properties are optional. 1. 1 Usage examples Overview. I have different metrics for filesets and those look very similar. {FUNCTION. Handy Tips; Regular expression: Preprocessing: Regular expression: Yep I understand scaling concerns. XML. ['name'] return values of all 'name' properties. To find a matching segment ignoring its ancestry (detached segment) it must be prefixed with '. 00 for these states. The preprocessing step result is the value returned by this function, for example, to perform Fahrenheit to Celsius conversion 2 Preprocessing details Overview. Using a regular expression preprocessing to filter unnecessary events of the VMware event log. 0. To create a global regular expression: Go to: Administration → General In the new version, all item value preprocessing is brought together and put in the hands of the user under a new Preprocessing tab in item configuration. fromJson(object) Converts data in JSON format to XML. == or === for comparison. Preprocessing regular expressions. Hello I'm configuring some items with regex preprocessing, The problem is that my master item returns a big response, which is transformed into LLD macros, here's a example: [{"{#X}":"abc" ;,"{#Y (same goes for multiline option) (on regex101 site on the right right of expression field there is /gm - click it and Whatever I added to the regular expression section didn't work. I then created a dependent item on the snmptrap parent item and tried to perform a regex on it. Back A custom regular expression name in Zabbix may contain commas, spaces, etc. I'm simply trying to understand what to put in the pattern and output boxes to change whatever is coming in to lower case text. I still wonder why not With that example, if I try to capture the "TEXT" expression with a Regex, only the first term from "DISCARD TEXT" would be found since there's no global flag. Failure to match the input value will make the item unsupported. regexp. The total length of header fields that can be added to a single HttpRequest object is limited to 128 Kbytes (special characters and header names included). The regular expressions demonstrated in this video are, (. log",Failed,,,skip] the results are unpredictable - for certain files i do see the "Failed" keyword in Monitoring - Latest Data, but I want to figure if we can split the lines using preprocessing. For example, Multiple trim operation in preprocessing 19-02-2019, 13:17. I tried it with regex formula in Regular expression with Preproscesing but I can't get it to work. The expressions used in triggers are very flexible. Sometimes it needs very complex regular expression to modify resulted values. I have an interesting scenario where an item collects a text value with multiple lines. Note that for Change and Throttling preprocessing steps, Zabbix has to remember the last value to calculate/compare the new value as required. I am receiving traps into Zabbix. With grep -P or in ZBX preprocessing field, it doesn't. On a working VMWare Hypervisor host check that the event log item Mastering Zabbix regular expression can significantly improve your monitoring capabilities, making your Zabbix setup more efficient and effective. Since Zabbix 4. zabbix_sender stuff Filters. See User roles for more information. name or $. After a regular expression has been created, it can be used everywhere regular expressions are supported by referring to it's name, prefixed with ** @*, for example, @mycustomregexp*. Regular expression names must not be quoted in other I used the regex: lastcontactdate="([^"]+)" and if I look via regex101. *) Returns only Item Preprocessing with Regex 1:00 Prepare sample text, and create regex 1:30 Discuss regex capturing groups 2:00 Modify item in Zabbix to use the regular expression 2:20 Zabbix 3. Permissions to call the method can be revoked in user role settings. It returns the name of the matched object or an index in string format of the matched array item. Usage. The resulting data is stored in the Zabbix database as for any other item; both history and trend values are stored and graphs can be generated. See Regular expressions: example. It finds the service I removed from the regular expression section again itself. Preprocessing is managed by the preprocessing manager process along with preprocessing workers that perform the preprocessing steps. It returns the name of the matched object or an index in string format of the matched array item. All regular expressions in Zabbix, whether created with the advanced editor, or entered manually, support In this example we are using a Zabbix agent item Transformations are executed in the order in which they are defined. Date and time functions cannot be used in the expression by themselves; at DISCARD TEXT" is repeated only for this example. This version added even more new ways to preprocess the data: JavaScript and Prometheus exporter support, If this is your first visit, be sure to check out the FAQ by clicking the link above. net/couponsIn this video, I add a pre-processing step to t Dear community! I would be grateful if you could help me with my Discovery rule problem. The preprocessing step result is the value returned from this function, for example, to perform Fahrenheit to Celsius conversion user must enter The syntax in EXPRESSION is the same as in trigger expressions (see usage limitations below). These previous values are handled by the preprocessing manager. ' , for example $. This section provides details of preprocessing by JavaScript. NET, Rust. Allow ${x} syntax for capture patterns Problem is that for strings that do not correspond regex zabbix server puts to log a lot of messages like this: Code: changed: Item preprocessing step #1 failed: cannot perform regular expression match on value "******" of type "string": pattern does not match Preprocessing of item values allows to define and execute data transformation rules for received item values. com" please, do make sure to disable those options in order to match the same result as in Zabbix: As to the "\n" parameter - it stands for the capture group number and not the occurrence number. Should result in a trigger name that contains: task updating application xyz. If Zabbix server or proxy is restarted or there is any change made to preprocessing steps, the last value of the corresponding item is reset, resulting in: Good Morning I have a system with 46 proxies all running 4. A value can be fetched, and before it gets stored it can be dissected or converted in several ways. For example, you can configure an item to collect only specific log entries or metrics that match a given pattern. 183. We used several NAT addresses to route the traffic. 2. 7, matched element names can be extracted by adding a ~ suffix to the JSONPath. 7. Report. This page provides examples of using correct escaping when using regular expressions in various contexts. Text preprocessing – a value is retrieved using Using a regular expression preprocessing to filter unnecessary events of the VMWare event log. What I did was go to https://regex101. In the following locations: graph names; map 1 Usage examples Overview. For example, $. RECOVERY. JSONPath is composed of segments separated by dots. You can use them to create complex logical tests regarding monitored statistics. That's why I think the authorities should intervene here. There is no preprocessing step to discard multiple lines of text. My aim is to create network interface items with a discovery rule (SNMP agent type) with a name got with come string transformation. Since for loop starts perfectly but when it goes to if condition, first of all you're not checking for equality instead you are assigining to json[i]. I can get the DATA to 1 conversion using Regular expression pattern DATA and output 1,then Hexa to Numeric conversion, but I do not understand how to get the 0 value when the regular expression result is false. One of these is, to apply regular expressions to the fetched value, in a “find and replace” kind of way. My formula: /\b[0-9,a-f]\b/g works on regex101. Once the regex is done, go to the Preprocessing tab in Zabbix. HOST} in regular expression preprocessing, but it would be nice if I could use it also in JavaScript preprocessing calling a method of a class ZabbixMacro like the following: When I tried to use regular expressions in preprocessing form, I found that Zabbix could not find the second occurrence (second escape sequence) of the regular expression. update. Regular expression names must not be quoted in other To find a matching segment ignoring its ancestry (detached segment) it must be prefixed with '. To use a module: Download the ZIP archive. 1 Preprocessing details Overview. All preprocessing is done by Zabbix server. 3 Preprocessing examples Overview. . But I don't want the first line logged into zabbix. Using regular expressions to filter unnecessary events from the VMware event log. 1 zabbix version, with regular expression. My value is: MSCluster_Network. com/community/tutorials/introduction-to-queries-mysql 8. These transformations/preprocessing steps are performed by Zabbix server or proxy (i Another approach that allows using matching groups and output control is to select "Regular expression" option in the "Preprocessing" tab and fill parameters, for example: This example Alternatively, you may use the Regular expression preprocessing step to extract matching groups and control output. Each event has valuable info and ending which I don't need absolutely. Preprocessing Links. XML/xpath preprocessing. 19 matched element names can be extracted by adding a ~ suffix to the JSONPath. Select a certain part of this string. 5. Regular expression names must not be quoted in other If this is your first visit, be sure to check out the FAQ by clicking the link above. 70, the digit "70" will be any digit, and want the replace function to skip that digit in preprocessing. Try Jira - bug tracking software for your Method Description; addHeader(value) Adds HTTP header field. Trademark Policy. VALUE<1-9>} macros can be used to reference function values of the trigger expressions and trigger recovery expressions, for example: {?{FUNCTION. We are now looking to do an upgrade and not all of 1 Usage examples Overview. Powered by a free Atlassian Jira open source license for SIA Zabbix. get. This example uses the Matches regular expression preprocessing step to filter Note that for Change and Throttling preprocessing steps, Zabbix has to remember the last value to calculate/compare the new value as required. toJson(data) Converts data in XML format to JSON. This section provides item value preprocessing details. Something like this: QMNAME(NAME1) STATUS(Running) QMNAME(NAME2) STATUS(Running) QMNAME(NAME3) STATUS(Standby) My goal is to create 2 items for each row and extract the instance name and its 1 Usage examples Overview. Preprocessing allows you to apply transformations to the received item values before saving them to the database. 00 or 1. We don’t need to specify these in Preprocessing parameters for the calculated item. Create an item prototype with "Dependent item" type in this LLD rule. The preprocessing step result is the value returned from this function, for example, to perform Fahrenheit to Celsius conversion user must enter 1 Usage examples Overview. The values are periodically calculated based on the arithmetical expression used. Item preprocessing rules will be internally classified as: Validation → Matches regular expression For example, temperature sensor returns +999C if it is off, normal range is -100C up-to +100C; Skip values that Regular expression: Match the value to the <pattern> regular expression and replace value with <output>. In zabbix preprocessing I have the following name: regular expression paramater: lastcontactdate="([^"]+)" output: /1 The current result I get is /1, however not the value from the xml text Consider the example of Zabbix bulk data collection for certificate discovery and monitoring on a Windows Server CA host. *) \0: 3 Preprocessing examples Overview. These examples use regular expressions in the preprocessing steps. tovfdna pixcl cnnbof wwgaq xnozfzr wehgtbav iqdm byqhur yehwbu zkp