Zabbix json preprocessing example. When the discovery rule runs, items such as sensor.

Zabbix json preprocessing example. Jan 13, 2025 · preprocessing: Tried different thing readed on the web. Each dependent item extracts its value from the master item's SNMP walk result using preprocessing, without performing separate SNMP requests themselves. result [? (@. Data editing (1:23:55) 3. For example, it is possible return 'abbi' from a value like 'Zabbix' if starting position is 2, and positions to return is 4. value[2] are created. without 'data' object Oct 7, 2022 · Zabbix JavaScript Preprocessing. data. 4 Discovery of SNMP OIDs (zabbix. What is pre-processing? (1:12:11) II. Most web API’s today use some sort of JSON -formatted data structure to deliver data. For example, here you can get basic examples of what XPath should look like to receive a certain result. Let’s look at the parameters. For example (mentioned in ZBXNEXT-4163) Is there any possibility of using LLD MACROS in item preprocessing. JSON { &quot;status&quot;: &quot;success&quot ZABBIX BUGS AND ISSUES ZBX-16234 clarify how to reference object in arrays for "JSON Path" preprocessing step Jul 1, 2022 · Joined: Apr 2020 Posts: 37 #6 12-01-2022, 16:22 Hello, It seems all good indeed, thank you very much !! However, I wonder why $. discovery" above, the server would generate one set of items, triggers, and graphs for the loopback interface "lo", and another set for interface "eth0". Data cleansing (1:18:40) 2. Learn how to make your life as a Zabbix admin easier thanks to LLD. Feb 4, 2021 · This topic is related to template development from scratch, bulk data input, and a lot of dependable items having different preprocessing steps each. Example: Jul 6, 2023 · This json is returned by a zabbix agent item and I've made a LLD on that master item. 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. 2. Script items are processed by Zabbix server or proxy pollers. It is possible to test: against a hypothetical value against a real value from a host Each preprocessing step can be tested individually as well as all steps can Preprocessing History Agent Text HTML JSON XML ZABBIX SERVER or ZABBIX PROXY Aug 24, 2021 · I guess it is, how Zabbix treats the regexes. Next, add a prepocessing step of the type JSONPath. The Grafana tutorials from 1 Escaping special characters from LLD macro values in JSONPath 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 Dec 28, 2022 · If I test with a preprocessing rule (JSONPath, $. Nov 12, 2023 · How to extract only a string using jsonpath in Zabbix? Asked 1 year, 10 months ago Modified 1 year, 10 months ago Viewed 396 times Feb 24, 2021 · So just to make sure I understood you correctly: With your example json will zabbix create the items per each "name" value? 2 Preprocessing details Overview This section provides item value preprocessing details. And there are many such parameters. For Oct 7, 2023 · Hi I am really struggling to understand the right process behind this. The preprocessing step result is the value returned from this function, for example, to perform Fahrenheit to Celsius conversion user must enter Aug 23, 2019 · Rather than using regular expressions to split the headers and payload during preprocessing, it would be helpful if there was an alternative output format for web. On a working VMware Hypervisor host, check that the vmware. https://<prometheus host>/metrics dependent items using a Prometheus preprocessing option to query required data from the metrics gathered by the master item There are two Jan 19, 2024 · Zabbix 6. length() parameter. e. For ultimate flexibility Zabbix should give users a way to create their own preprocessing rules. AutoScalingGroups. Is there any possibility of using LLD MACROS in item preprocessing. Contents I. . The Zabbix Server also has an application programming interface (API). ZABBIX BUGS AND ISSUES ZBX-22182 In inherited item SNMP walk to JSON preprocessing has enabled remove and add buttons. object. Sep 3, 2023 · Hello, could you please advise whats wrong. And then LLD came around and suddenly we were able to ‘discover’ entities, and based on those discovered entities There are many scenarios that would highly benefit from being able to use the one item value as the item key for a different item. That’s where JavaScript preprocessing comes in. If these keywords resonate with you, keep reading. Item configuration: Note the use of the POST method with JSON data, setting request headers and asking to return headers only: Item value preprocessing with regular expression to get HTTP code: Checking the result in Latest data: Example 4 Mar 2, 2025 · Just one thing to note: multiple times when I was working with LLD, I would get the json value that Zabbix receives and use it in a preprocessing step (JSONPath) to simulate what the LLD Macros were extracting. Example 2 Get disks stats using Zabbix agent vfs. 4#9120004-sha1:625303b708afdb767e17cb2838290c41888e9ff0. I drafted it after needing to go beyond a simple value lookup inside a JSON block to something more involved, namely evaluating multiple conditions to arrive at a final true/false value. device. 15 (Unix) DNS lookup threads: 10 Preprocessing DATA FLOW Preprocessing History Agent Text HTML JSON XML ZABBIX SERVER or ZABBIX PROXY Preprocessing PCRE Examples Preprocessing Data in JSON format are needed for discovery and the Prometheus to JSON preprocessing option will return exactly that, with the following attributes: metric name metric value help (if present) type (if present) labels (if present) raw line For example, querying wmi_logical_disk_free_bytes: from these Prometheus lines: Jan 28, 2024 · Hello, i need to monitor an url with curl (or web scenario) and count result. Preprocessing parameters It is pretty Jul 8, 2019 · Your example is a little off the edge for LLD or Zabbix but let's try and take an example using Item Prototype. When I try that (I wrote \g at the end of regex), I receive this error: cannot perform regular expression "\ [? 2 Item value preprocessing 1 Usage examples 2 Preprocessing details 5 CSV to JSON preprocessing 3 Item types 3 SNMP traps 4 IPMI checks 6 Log file monitoring 7 Calculated items 8 Internal checks 9 SSH checks 10 Telnet checks 11 External checks 12 Aggregate checks 13 Trapper items 14 JMX monitoring 16 Dependent items 17 HTTP agent 18 Prometheus Existing functionality of Zabbix preprocessing is limited for a set of supported preprocessing rules. page. namespace=~"openshift")]. 0 Prometheus to JSON Prometheus to JSON preprocessing step works the same way as 'Prometheus pattern' but it outputs LLD-ready JSON instead. data[59]. In this video I will show you how to create an Item that uses the HTTP Agent type to query an external REST API and extract its data. How it works May 14, 2019 · 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. value[0]. For example, you may want to extract the customer name and interface number from the following LLD macro for the purposes of event tagging: Mar 15, 2020 · Making POST request with credentials to get response in JSON format with "access token". Sep 15, 2024 · After a specific request from a colleague in the Zabbix Brasil community, I decided to create this post to provide a general idea of how the LLD (Low-Level Discovery) feature works and how you can create your own custom rule based on your needs. Parsing structured JSON in Zabbix is easy with JSONPath—until you need more advanced filtering or conditional logic. This is done by utilizing master-dependent item logic and combining it with low-level discovery and newly introduced preprocessing rules. 3 Preprocessing examples Overview This section presents examples of using preprocessing steps to accomplish some practical tasks. For instance, the below is one of the results Zabbix is getting. Data preprocessing, used in learning and data collecting to make input data easier to work with. I don't see how to put global flag in zabbix regex. Instances. buffer and transaction log) and is important. This blog post will cover the drawbacks of the legacy SNMP monitoring approach, the benefits of the new The example data you gave, is that entire JSON array the string data that comes in on the 1 singular item? If your goal is to get the values from all of the contained objects, I think I would recommend a JavaScript preprocessing item. ZABBIX 6. 0 and still belongs to one of the all-time favorites. I'd like to try the "new" method where from a single non-specific json object I can make the discovery and create dependent items altogether. 4. This post is likely pretty niche. for example i'm able to (from server cli) to: Overview JSONPath consists of segments separated with dots. The item value preprocessing allows to define and execute transformation rules for the received item values. Before LLD was available, adding items was all manual work. ZABBIX FEATURE REQUESTS ZBXNEXT-4724 Advanced preprocessing: validation and throttling rules, discarding values and setting errors Add item preprocessing jsonpath function to extract fragment from json data with a lightweight version of jsonpath (simple subset of functionality). Note that since Zabbix 4. It's supported in: items (item prototypes) low-level discovery rules Configuration To configure a CSV to JSON preprocessing step: Go to the Preprocessing tab in item / discovery rule configuration Click on Add Select the CSV to JSON option The first parameter allows to set Apr 1, 2021 · The low-level discovery was introduced in Zabbix 2. {&quot;data&quot;: [{&quot;Host_Name&quot;: &quot;example 1&quot;, &quot;Running&quot;: True}, Zabbix : Item Pre-Processing With Regex In Zabbix 5 SBCODE 24. Here an example of what I like to accomplish: Preprocessing is done by Zabbix server or proxy (if items are monitored by proxy). Oct 25, 2023 · ZABBIX BUGS AND ISSUES ZBX-23607 "SNMP walk to JSON" preprocessing step cannot parse unquoted values that start with a double quote character There is an advanced editor for creating and testing complex regular expressions in Zabbix frontend. The reason for using the API is that you either want to create your own custom interface for your Zabbix Server, e. The dot before a bracketed segment is Dec 22, 2022 · type : zabbix agent key : discovery. 14 Preprocessing by Javascript details Javascript preprocessing is done by invoking JavaScript function with a single parameter 'value' and user provided function body. When parsing such string, Zabbix assumes that it is a quoted string and Together with ZBXNEXT-4200 and ZBXNEXT-4163, support of 'advanced' JSON Path expressions is required to select specific JSON object's attribute from the item. hits[0]. name) in the discovery rule I get expected (?) results, it returns ["AP01 Upstairs","AP02 Lobby","Total-AP"]. Making original JSON object a fully LLD compatible JSON Array that can be used for NGINX zones discovery. Please see the attached screenshot for what I'd like to see (a preprocessing step). cars update interval : 1h I don't get errors in GUI, but I would like to create the dynamic items (brand) and see their dynamic value (nb) for my host. I believe it will work as is, except some of the JSON objects have brackets in the name such as "Voltage (V)" and I simply can't get past this as is due the following error: 1. For Apr 19, 2019 · Hi I collect data with script (zbx-hpmsa) from HPE MSA 2040. I. As a result, it is possible to get unquoted string that starts with a double quote character. Essentially i have a script that runs and pulls back a load of Host Names and their associated Running Status (in JSON formatted to let Zabbix read it. You are able to use pre-processing rules to transform your incoming data, but in this example, the script with transform the data into JSON before it reaches Zabbix. It's supported in: items (item prototypes) low-level discovery rules Configuration To configure a CSV to JSON preprocessing step: Go to the Preprocessing tab in item / discovery rule configuration Click on Add Select the CSV to JSON option The first parameter allows to set Dec 15, 2022 · I created discovery rule with master item as previous json. element] need fields: URL METHOD (GET,POST, etc) USER PASSWORD AUTH TYPE (Basic, Digest) SSL options (!)POST DATA (Large field like for SQL ODBC) zabbix should parse result JSON and extract field by path json Nov 17, 2021 · If you want to get a specific field from the JSON you have to configure an item of the type HTTP agent: Do NOT check Convert to JSON, it might be tempting, but it is meant to convert non-JSON answers to JSON. Data reduction (1:30:21) 4. And now to the problem. 6 CSV to JSON preprocessing Overview In this preprocessing step it is possible to convert CSV file data into JSON format. g. A segment can be either a simple word like a JSON value name, * or a more complex construct enclosed within square brackets [ ]. Item prototype = "Checkout for user {#USERNAME}" Sep 29, 2023 · The first thing I was able to do using a JSONPath preprocessing step inside the Corrupt Sessions item, with a $. Reference dependent item prototypes in trigger prototypes using the same macros from the discovery rule. That’s why we prepared some great examples of how you can use that tool to achieve the same. The correct path for your example would be: As an example, a Script item can be configured to make an HTTP call, then process the data received in the first step in some way, and pass transformed value to the second HTTP call. All values with preprocessing (before Zabbix 7. If your intent is to remove part of json and only keep those matching your regex, you should do it with JS preprocessing. Item Preprocessing with JavaScript Video Lecture SBCODE (Pay Per View) Hello, I have a bunch of "old" LLD where I create a json object specifically for the zabbix LLD and then each item discovered is individually monitored. com about Dependent Items: Aug 2, 2022 · Hello, I am extracting a JSON data set and trying to run discovery with LLD macros and item prototypes. A very cool feature to have Nov 18, 2020 · In this lab we will use a bash environment and utilities ‘curl’ and ‘jq’ to perform Zabbix API calls, do some scripting. The separating dot before bracket segment is optional and can be omitted. Naturally the preprocessing rule is not left there, just used for testing and the {#APNAME} LLD macro is the only thing left in the discovery rule. Overview This section presents a step-by-step real-life example of how web monitoring can be used. Story stars back in a day when a “Test now” button was invented inside the item preprocessing section. eventlog item is present and working properly Oct 21, 2020 · Preprocessing is a great tool to make data collection precise and crystal clear. Then using preprocessing steps' JSON Path with parameters $ . Preprocessing is managed by a preprocessing manager process, which was added in Zabbix 3. Mar 26, 2024 · preprocessing to JSON not accepting regular expression for metric in discovery rule 26-03-2024, 16:53 Hi, I am new to this forum, and have a question. Zabbix 4. Basically, whenever Zabbix standard preprocessing options fall short, there is a good chance it can be done with Javascript preprocessing. file. contents [/proc/diskstats] item: zabbix_setOpenWeatherTemp. 4, along with preprocessing workers that perform the preprocessing steps. maximum I have tested the step: I got the value what i needed, but when i check on item i have these problems: Preprocessing failed for: &quot;timeStamp&quot;: &quot;2023-03 Jun 28, 2021 · Using Zabbix Dependent Items and JSONPath we can significantly reduce the number of times we hit an API when monitoring the metrics it makes available to us. garage. Javascript preprocessing Javascript preprocessing is done by invoking JavaScript function with a single parameter 'value' and user provided function body. My problem is that it doesn't work in real life, It seems my item prototype is using with what the early item returns (could be logical 'cause it's the master item). The Type of information field is displayed at the bottom of the tab when at least one preprocessing step is defined. _source. Zabbix May 11, 2021 · Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges, Oct 26, 2022 · I'm creating a monitoring in Zabbix where I want to perform a filter on a json. VALUE PREPROCESSING Preprocessing of item values allows to define and execute data transformation rules for received item values. GitHub Gist: instantly share code, notes, and snippets. I read several times the documentation, but I find that it explains very badly how to do this, and I can't do it. 0 version, not the 2. 4, with one of the preprocessing options being JSONPath, where you can specify the JSON path to be used to convert output to JSON — $. Example: Zabbix Acceptance LLD rules must support preprocessing functionality like it is currently supported for items and item prototypes It must include preprocessing actions LLD will accept normal JSON containing an array, i. timeseries[0]. 0. I have different metrics for filesets and those look very similar. com about item preprocessing: Item value preprocessing allows to define and execute transformation rules for the received item values. 2 Item value preprocessing 1 Preprocessing testing 2 Preprocessing details 3 Preprocessing examples 4 JSONPath functionality 1 Escaping special characters from LLD macro values in JSONPath 5 JavaScript preprocessing 1 Additional JavaScript objects 2 Browser item JavaScript objects 6 CSV to JSON preprocessing 3 Item types 1 Zabbix agent 1 Zabbix Jan 16, 2023 · Zabbix Preprocessing JavaScript Asked 2 years, 8 months ago Modified 2 years, 8 months ago Viewed 1k times Generated at Tue Feb 11 11:42:23 EET 2025 using Jira 9. Here is an example of JSON code: Dec 29, 2020 · option 1: based on your item, create a dependent json LLD that creates several data elements (type-dependent on the same master item) and the corresponding triggers. 4 JSONPath functionality Overview This section outlines the supported JSONPath functionality within item value preprocessing steps. 7K subscribers 117 2 JSONPath functionality Overview This section provides details of supported JSONPath functionality in item value preprocessing steps. InstanceId Sep 17, 2020 · WHAT IS PREPROCESSING? In computer science, a preprocessor is a program that processes its input data to produce output that is used as input to another programBoth require tuning(e. version. And this works nicely, I get the number of corrupt sessions. 0, so there will be a slight difference and limitation in terms of the query language that you can use. JSONPath consists of segments separated with dots. metric. 4 introduced major improvements to SNMP monitoring, especially when it comes to collecting large numbers of metrics from a single device. com ? Do you know any other json parser which would work more like Zabbix' so I could trust the tests I make please ? DEEP DIVE IN ZABBIX PRE-PROCESSING WHY PREPROCESSING? The retrieved data is freeform and is not fit for calculations, aggregations and/or optimal data storage: 1 Additional JavaScript objects Overview This section describes Zabbix additions to the JavaScript language implemented with Duktape, and supported global JavaScript functions. Nov 5, 2019 · Remember that Zabbix supports XPath 1. 2, the format of the JSON returned by low-level discovery rules has been changed. Very many modern services support REST API and return JSON as result It is very needed to add REST API check for example to query Elasticsearch i. Parameters: value - the value to check; start - start position of the substring; length - positions to return in substring. Feb 10, 2023 · In preprocessing you should be using the HttpRequest class that is provided by Zabbix for fetching data over HTTP protocol. Everything works fine, except for data that has "-". ['device-name'] (see attachment 1) on which I can base my dependent item prototype defined as seen on attachment 2. 17 Prometheus checks Overview Zabbix can query metrics exposed in the Prometheus line format. Let me provide a scenario. 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. The initialization of multiple HttpRequest objects has been limited to 10 per script execution. 2 News - preprocessing Limits for JavaScript objects in preprocessing (backported in 6. 4 to try out the new SNMP OID discovery way to bulk get SNMP described in this section of the documentation. get Description Parameters Return values Examples Finding items by key Finding dependent items by key Find HTTP agent item Retrieving items with preprocessing rules See also Source Overview JSONPath consists of segments separated with dots. com) The documentation describes in a good way how to create the snmp item and the discovery rule using Dependent item and SNMP walk to JSON preprocessing. To create a global regular expression: Go to: Administration → General It looks like algorithms used by snmpwalk to decide if the string should be quoted depend on presence of MIB and presence of hint for an OID in the MIB, at least that's my understanding after taking a quick look at SNMP code. So, can anyone helps me finding what I'm missing. value[1], sensor. ‘curl’ is a tool to exchange JSON messages over HTTP/HTTPS. When the discovery rule runs, items such as sensor. path removing [] and &quot;&quot;. For your json example the simple Json Path as in my example shoud definitely work. I'm looking for a step-by-step tutorial, I've read some posts on message boards but I'm looking for a Version: Apache 2. Preprocessing is managed by the preprocessing manager process along with preprocessing workers that perform the preprocessing steps. For example process JSON based on LLD result: like: Jul 21, 2020 · Low-Level Discovery is built-in functionality in Zabbix, which automatically creates items, triggers, and graphs based on JSON input received from the Zabbix Agent or the Zabbix Server. Why do we need preprocessing? (1:16:08) 1. pod for example doesn't work on jsonpath. For example: Using macro functions 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. get (or an alternative built-in item) that returns the page output in the format of a JSON object with keys for "status, "headers" and "data". restapip [metric_name, json. Data wrangling (1:33:34) III. The preprocessing step result is the value returned from this function, for example, to perform Fahrenheit to Celsius conversion user must enter Supported value types: String, Text, Log. Thanks a lot in advance for your help. label [‘device’]. 24 Feb 2025 Calculating Tricky Zabbix Items with JavaScript Parsing structured JSON in Zabbix is easy with JSONPath—until you need more advanced filtering or conditional logic. 4 CSV to JSON preprocessing Overview In this preprocessing step it is possible to convert CSV file data into JSON format. 1 Preprocessing testing Testing 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. Thank you, Cyber. [*]. I have created an item with preprocesing on json path - $. you can use JSON libraries in it, iterate through all of the objects and read the value string, ignore empty/hyphen values, convert it from a string to a float Feb 19, 2021 · I'm using the pre-processing option on Zabbix to grab what I'm after but I can't get the code correct. This last works in test mode with JSON in values. Nothing fancy here except a {#DEVICE_NAME} LLD macro with the jsonpath $. 14) The total size of all messages that can be logged with the log() method has been limited to 8 MB per script execution. The problem I have is how to then create the item prototype for this Many devices and services now provide REST APIs that you can query and get JSON formatted data as a response. 1. Glad you solved it, however that sounds way to complicated. Click on Add to select a supported transformation. JSONPath is composed of segments separated by dots. hits. For example process JSON based on LLD result: like: 1. Configuration In the Type field of item configuration form select Script then fill out required fields. For example: Apr 30, 2020 · I am trying to configure an item in Zabbix to preprocessing some data collected and I need to work out a piece of Javascript code in order to loop through the result spit by Zabbix which is collect Now use a JSONPath preprocessing step to get the item value: $. py This script will create an HTTP Agent agent with JSON preprocessing that will get the current temperature for given city in Kelvin with 30s refresh rate. Dependent Items and JSONPath allow us to dig through that data with ease! Excerpt from zabbix. Filtering VMware event log records This example uses the Matches regular expression preprocessing step to filter unnecessary events from the VMware event log. , a new web interface, IOS or Android app, or integrate into another monitoring system. com ? Do you know any other json parser which would work more like Zabbix' so I could trust the tests I make please ? DEEP DIVE IN ZABBIX PRE-PROCESSING WHY PREPROCESSING? The retrieved data is freeform and is not fit for calculations, aggregations and/or optimal data storage: Jul 1, 2022 · Joined: Apr 2020 Posts: 37 #6 12-01-2022, 16:22 Hello, It seems all good indeed, thank you very much !! However, I wonder why $. I am using Prometheus Node Exporter for monitoring inodes in filsets. In the example with "net. 3 Javascript preprocessing Overview This section provides details of preprocessing by Javascript. access_token. 5. This allows you to programmatically configure and retrieve data from the Zabbix Server. item. And i got instance ids with item prototype that have next preprocessing JSONPath - $. For example adding new disks, new interfaces, network ports on switches and everything else was all manual labor. value Example 3 Checking if Zabbix API is alive, using apiinfo. web. 2 JSONPath functionality Overview This section provides details of supported JSONPath functionality in item value preprocessing steps. Note that the conversion to desired value type (as defined in item configuration) is performed at the end of the preprocessing pipeline; conversions, however, may also take place if required by the corresponding preprocessing step. Built-in objects Zabbix The Zabbix object provides interaction with the internal Zabbix functionality. See also: Preprocessing examples Configuration Preprocessing steps are defined in the Preprocessing tab of the item configuration form. 12. The change is trivial, but will allow MUCH greater flexibility in using Zabbix and will allow to get rid of quite a few external scripts. if. In this way, we can simulate the entire preprocessing stack. You already have JSON, so you don't need it. Two steps are required to start gathering Prometheus data: an HTTP master item pointing to the appropriate data endpoint, e. Oct 1, 2019 · Preprocessing was introduced in Zabbix 3. Dec 4, 2023 · Hi, I upgraded to Zabbix 6. 1, all values May 7, 2020 · Excerpt from zabbix. tcop8 jaqa gzpwi zbhidr mn kctao ibv3kt rc ih rx6lrrv