Fortunately, Prometheus provides 4 different types of metrics which work in most situations, all wrapped up in a convenient client library. Jun 24, 2020 · 3. (a) Fluid depth must be the same on both sides, or the pressure each side exerts at the bottom will be unequal and there will be flow from the deeper side. 0 func (g * Gauge ) Add(delta float64 ) Apr 10, 2023 · and type's value could be one of: free、running as so on. Dec 28, 2017 · So far in this Prometheus blog series, we have looked into Prometheus metrics and labels (see Part 1 & 2), as well as how Prometheus integrates in a distributed architecture (see Part 3). // Prometheus will not allow you to ever export metrics with // inconsistent help strings or label names. I tried using changes function but either I did not understand its purpose or it simply did not do the job. time() both are epoch time (aka unixtime ), just as Prometheus time() function. They track the number of observations and the sum of the observed values, allowing you to calculate the average of the observed values. Registerer. Text size. Title - Enter a numeric value for the gauge title size. If a deadlock is released by postgres shouldn't the counter decrease it's value and then maybe a gauge is better suited for t Dec 24, 2017 · PREVIOUS. – markalex. Secondly, using gauge as counter is not a good idea as there is a special type for that - Counter. Get the current value. The London Perl and Raku Workshop takes place on 26th Oct 2024. Calculating the Delta Count and sum of observations. dec(10) # Decrement by given value g. Current way to work around it is to use the mode all and to ignore gauges in Prometheus and with the tag pid. It has multiple meanings as both a noun and a verb, many of which have to do with measurement. You are registering the gauge to the SimpleMeterRegistry. Prometheus is regularly scraping your service for metrics though, and when your gauge’s current value is returned Prometheus and Graphite are open-source monitoring tools used to store and graph time series data. It exposes a counter metric. 0 tasks{queue Jan 17, 2021 · 3. An endpoint that calls gather which returns MetricFamily s through an Encoder. Gauges can go up and down over time, and scrapes take a snapshot of the current value. This video explains the four different metric types in Prometheus: Gauges, Counters, Summaries, and Histograms. Individual organizations may want to approach some of these practices, e. Standard options in the panel editor pane let you change how field data is displayed in your visualizations Gauge metric, to report instantaneous values. Sep 27, 2018 · If the gauge has any labels defined, the values for them must be given first. In that case, the Gauge will still exist, but it will not be exported anymore, even if a Gauge with the same label values is created later. builder("greeting_service_gauge", new May 20, 2019 · Figure 1 – query result for our counter metric. It can only be used with counters. Metric names. Currently, libraries exist for Go, Java, Python, and Ruby. In this 4th part, it is time to look at code to create custom instrumentation. 2 - The idea is to create another client to expose metrics for Prometheus, so we will interface with two implementations (datadog and prometheus) and save in both places at this first time, but as you said above the prometheus lib enforces to use always the same number of labels. void SetToCurrentTime Set the gauge to the current unix time in seconds. Container Insights Prometheus support involves pay-per-use of metrics and logs Aug 10, 2023 · For stored Prometheus metrics, PromQL is the main way to query and retrieve the results you are looking for. 3. It’s like a magician’s rabbit, popping up and down without necessarily following a consistent trajectory. New() accepts the standard prometheus. The workers never run in parallel. @g. If the name parameter itself is empty, an empty string is returned, no matter what. Histograms and summaries both sample observations, typically request durations or response sizes. You can rate examples to help us improve the quality of examples. Value - Enter a numeric value for the gauge value size. Shotgun Gauges: Recommended Uses. Comparing the gauge graph to the changes() output with a verity of time To create a Gauge without labels and register it with the default Registry: Gauge simpleGauge("simple_gauge"s); simpleGauge. " Dec 27, 2019 · Info: the rate function calculates the per second rate of increase averaged over the provided time interval. When the latter happens, all labels' values are reset to 0, then every time I detect duplicates the Gauge's value for the corresponding labels is set to max (previousValue Mar 29, 2023 · ps. 这里要明确一个概念：数据指标类型只是Client端的一个概念，用于维护Metric的生产，以方便在业务上有所区分。. 410 bore. 它可以用于测量可增长和可减少的值，例如内存使用量、磁盘空间等。. Mar 8, 2024 · Summing up, Prometheus and OpenTelemetry provide metrics implementations with slightly different angles. Gauge is a number which can either go up or down. double Value const Get the current value of the gauge. So the higher the timerange the smoother result we will get. void Set (double) Set the gauge to the given value. Share Sep 6, 2022 · The words gauge and gage have the same pronunciation ( [ geyj ], rhymes with page ). I have tried with atomic integer too but still problems. Add amount. Figure 11. Remove the data point with the given label values. Jan 10, 2023 · 那么为什么gauge类型中使用了uint64类型而不是float64类型的字段来存储gauge代表的即时值呢？这就要从Prometheus go client的一个特性说起，那就是对Gauge即时值的修改要保证goroutine-safe。具体来说，gauge使用的是atomic包提供的原子操作来保证这种并发访问安全。 Aug 8, 2018 · Context: I'm using a Prometheus Gauge to monitor the maximum number of duplicates found in my data. The 20 gauge comes in second, followed by the 28 gauge and the . Of all the shotguns in the United States, 12 gauge guns are by far the most popular. Gauge是一种指标类型，用于表示在任意时间点上的单个数值。. On the other hand, if you have different device types, such as routers, switches, and access points, and you want to count them separately, use GaugeVec with a type label. , ready to be registered in the prometheus. From prometheus-net documentation. While Prometheus is the de facto standard, covering metrics creation, storage, and query, OpenTelemetry is newer, covering only the generation of metrics. Apr 26, 2020 · I'm exporting some metrics about running tasks, the available data includes the current number of tasks by their status and queue: # TYPE gauge tasks{queue="high", status="queued"} 2. Study the data you can expose and decide which metric type you can use. Support for histogram metrics is planned for an upcoming release. I can compute the number of time series using A{name=&quot;XYZ&quot;} but I'd like to compute how many new time series were generated in the last 5 May 29, 2023 · NewGaugeFrom constructs and registers a Prometheus GaugeVec, and returns a usable Gauge object. The inner query avg by (group, service) (avg_over_time({__name__="metricA"}[1h])) will run 10 times. Set method. Set the gauge to value. If the counter is incremented by more than 1, then changes() will return lower results than increase(). e. It returns a *prometheus. I wrote a Spring Boot app and I'd like to expose custom metrics to Prometheus with Micrometer. In this article, you will learn the basics of Prometheus including what metrics are, the different types of metrics and when they are used. # HELP http_requests_total The total number of HTTP requests. Jan 21, 2022 · Prometheus has four metric types, among which the two basic ones are counter and gauge. Make sure the logic of exposing does not have the overhead in latency-sensitive applications. slideWindow() zones := data. I’ve a custom metric that change of type in the metric file (mistake from developper). naming conventions, differently. count and . A Prometheus gauge is a specific type of metric used for measurements. A Gauge is typically used for measured values like temperatures or current memory usage, but also "counts" that can go up and down, like the number of running processes. For instance, avg_over_time() is what you may use to compute a moving average of some metric. Metric implementations included in this library use this function internally to generate the fully-qualified metric name from the name component in their Opts. When invoked, the function will be passed no arguments and is expected to return a single value. Expand description. A gauge is intuitive as it matches our expectation for a metric, i. memory_usage_bytes > 1024. ToFloat64 returns the value of the collected Metric. yml file that you can place anywhere on your hard drive: Jun 12, 2024 · BuildFQName joins the given three name components by "_". set_function extracted from open source projects. So I’ve start to scrap metrics as counter, but it is really a gauge. Summary. To replace negative derivatives with null values, set the nonNegative parameter to true. hi all…. and then a “push Mar 6, 2021 · I would like to monitor the number of times values were set to a Prometheus Gauge per second. inc() # Increment by 1 g. void Decrement Decrement the gauge by 1. Note that the number of observations (showing up in Prometheus as a time series func (nc *NodeController) updateEvictionMetric(metric *prometheus. An example of my exporter: // prometheus go client. Example query per second and response time metrics. . It can be used for metrics like the number of pods in a cluster, the number of events in a queue, etc. If your company depends on Perl, please consider sponsoring and/or attending. Unfortunately, I cannot add another counter and should use the gauge. I tried to expose metrics via a standard method through HTTP client. @Autowired. Sep 16, 2019 · Currently there is no way to get the value of a counter in the official Golang implementation. Reload to refresh your session. Oct 27, 2022 · When deleting a gauge from a gaugevec, the gauge value is still presented on the graph as the value it was last set to. This second part will look into more details in the 4 different types of Prometheus metrics: Counters, Gauges, Histograms and Summaries. May 9, 2024 · It expects that this results in exactly one Metric being collected, which must be a Gauge, Counter, or Untyped. Quantile samples are mapped to a metric of type gauge with the . set(42); Apr 6, 2022 · The main difference between gauge and histogram metric types in Prometheus is that Prometheus captures only a single (last) value of the gauge metric when it scrapes the target exposing the metric, while histogram captures all the metric values by incrementing the corresponding histogram bucket. size" for the name of the Gauge, an object list and a lambda ( () -> Double) here it's list::size. Additionally, there is very little chance that gage will ever make its way into your writing, as evidenced by the fact that dictionaries now mark it as Feb 10, 2020 · 1. Sep 21, 2020 · So make sure you don't expose it for tens of threads that are trying to update it at the same time. You switched accounts on another tab or window. Gauge: This represents a value that can go up or down, like temperature or current memory usage. Nowadays, many CNCF projects expose out-of-the-box metrics using the Prometheus metrics format. Gauge metrics are typically used to track the current state of a system or application. Jun 10, 2023 · What are Gauge Metrics? In Prometheus, a gauge metric is a metric that represents a single numerical value that can go up or down over time. By default, derivative() returns the rate of change per second. just before Prometheus collects data from you. In this demo, we will run Prometheus locally in a Docker container and we, therefore, need some configurations in a prometheus. Next, let’s adjust the sample app to increase the counter every few seconds. Nov 5, 2018 · 1. Both are open source and primarily used for system monitoring, yet Prometheus takes on additional Nov 23, 2022 · Both workers update the same gauge, call it x, during a run. Grafana The included Prometheus browser graph is nice for basic visualization of our metrics but we Gauges can go up and down. However, the exporter sometimes misbehaves and breaks monotonicity like this: T1: X; T2: X + 1; T3: X; Example: As a result, when applying rate() or increase() on the counter, we get huge spikes, because Prometheus understands that the counter was reset to 0, and then Metrics collected by Prometheus are critical for staying alerted when something goes wrong in your system. Just need to cast the collector to GaugeVec and reset it: prometheus. Below is an example of a full-fledged Prometheus metric exposition, including comments, HELP and TYPE expressions, a histogram, a summary, character escaping examples, and more. size", list, List::size) . # TYPE http_requests_total counter. prometheus. Set the starting value from which every gauge will be filled. Use Flux to query and transform Prometheus histogram metrics stored in InfluxDB. Jul 31, 2019 · The problem is when i start the app and i send the request and the response is ok i see in prometheus that the gauge value is 1, but when i stop the server and i send another request i expect that the gauge value should be 0 but it is 1 again. They can be visualized on dashboards or continuously monitored by Prometheus’s AlertManager to trigger notifications whenever the data crosses a predefined threshold. Prometheus does support binary comparison operators between an instant vector and a scalar. Sets a value-returning callback function for the gauge. set_function. You can also avoid double counting by incrementing your own counter and use an CounterFunc to collect it. Prometheus primarily deals with four types of metrics: Counter: A metric that only increases or resets to zero on restart. Dec 2, 2019 · Metric types. So in case you need to collect and Oct 26, 2020 · The data can be visualized by a console template language, a built-in expression browser, or by integrating Grafana (which we will do after setting up Prometheus). A gauge is a metric that represents a single numerical value that can arbitrarily go up and down. However, python code will only run on demand, and with parameters. Feb 2, 2019 · rate (counter [1s]): will match ICH because average will be calculated from one value only. You’ll also find them in core Kubernetes components like the API Aug 22, 2022 · We have a system with a Prometheus exporter. Dec 12, 2019 · Hello I was thinking deadlocks be represented by gauge data type in prometheus as it can increase and decrease. If the gauge is labeled, each label combination requires its own function. For example, this expression returns the unused memory in MiB for every instance (on a fictional cluster scheduler exposing these metrics about the instances it runs): (instance_memory_limit_bytes - instance_memory_usage_bytes) / 1024 / 1024. After unregistering, the // unregistered metrics will cease to show up in the /metrics HTTP // response, but the registry still remembers that those metrics had // been exported before. number of operations queued, partitioned by user and operation type). After that, you will expose metrics of a Golang Jan 21, 2022 · 7. g. Feb 4, 2022 · We want to emit a gauge indicating whether the tests succeeded or not (basically a binary "1" or "0"). Text format example. You signed in with another tab or window. Is there a way to immediately discontinue the gauge data upon deletion? Setting the value to 0 retains the stale gauges, which accumulate over time, without a TTL. I placed the more intended “pull” based example in GitHub - georgelza/prom_wrapper_2: Simple Prometheus TestApp for Golang - Pull method 2. The Prometheus metrics with the unsupported histogram metric type are dropped by the CloudWatch agent. A counter that monotonically increases, on the other hand, is not so intuitive. We have change in the metric file, but prometheus continue as it is a counter. Oct 26, 2020 · Prometheus provides a query language PromQL, check the official documentation for more details. Luckily, client libraries make this pretty easy, which is one of the reasons behind Prometheus' wide adoption. Use Flux to query and transform Prometheus gauge metrics stored in InfluxDB. The naming makes the purpose of these functions quite obvious. 4. The data duplication check itself is triggered once on every 4 hours. . We use changes currently but this prevents us from showing gauge values after a fresh deploy since the gauges Feb 20, 2022 · The gauge pressure is Pg = hρg P g = h ρ g and is found by measuring h h. A gauge is both a measurement and a measurement tool. Initialize label values. 2) # Set to a given value There are utilities for common use cases: g. Gauge is a metric that represents a single numerical value that can arbitrarily go up and down. PromQL functions like max_over_time, min_over_time and avg_over_time can be used on gauge metrics. There are four primary Prometheus metric types PromQL can query: counters, gauges, histograms, and summaries. Use of this library involves a few core concepts: Metric s like Counter s that represent information about your system. For example, if request duration is measured for Nov 1, 2023 · 在Prometheus中，GaugeVec和Gauge是用于测量和监控指标的两个 不同的 类型。. I use the following query to track the total number of Jan 8, 2017 · Increment the gauge by the given amount. void Decrement (double) Decrement the gauge by the given amount. Your approach is reasonable and used by Prometheus' own exporters: notice go_info on this node_exporter metrics page. Base units. 0, the server now stores this metadata in memory for each scrape target, and external users can query the metadata using an API endpoint. , it represents a numeric value that measures something like temperature, memory usage, etc. Jul 29, 2022 · Summing up, Prometheus and OpenTelemetry provide metrics implementations with slightly different angles. The Collector provided is typically a simple instance of Gauge or Counter, or – less commonly – a GaugeVec or CounterVec with exactly one Aug 11, 2021 · # HELP name description # TYPE name gauge name 1. 1. On other hand, another library we used only expose an Store method to the user, which is been called when the library want to set a metric to an concrete value (with different labels group), we implement Store use gauge. Similarly, stddev_over_time() can be used to produce a moving standard deviation. 6287478272555726e+09 The value of the metric and time. This is used if you want to count the same thing partitioned by various dimensions (e. If registry=None to avoid double reporting, only the default value of 0. Use the unit parameter to customize the rate unit. It will run for a few seconds and exit. but when we migrate to open-telemetry，we only have two choice: . The CloudWatch agent supports the counter, gauge, and summary metric types. 2. GaugeOpts{. Types of Prometheus Metrics. getZones() for _, z := range zones Jul 29, 2019 · 8. NewGaugeVec(prometheus. 2 11. But is it possible to query a gauge metric that is greater than X and smaller than Y at the same time? How can I achieve something like memory_usage_bytes > 1024 && <= 2048? time-series. GaugeOpts and respects them, additionally it accepts a slice of strings defining the labels your functions will have. track_inprogress() def f(): pass Jun 15, 2018 · You need to keep the value in a map in the meantime so it avoid the garbage collection. Gauge. Where Prometheus differs from other other monitoring systems is May 12, 2021 · 1. If you can pair these two words by the common letter “u,” you will be all set. builder("cache. You can use a function like this to initialise and return GaugeVec just once and then use it to assign dynamic label values to it. Notice how we then point the gauge at the map and us a lambda to pull out the value to avoid the garbage collection. The 10 gauge and 16 gauge are much less common than the rest, but are by no means rare. from prometheus_client import Gauge g = Gauge('my_inprogress_requests', 'Description of gauge') g. set_function - 33 examples found. Gauge and measure both have the letter “U” in them. type customMetrics struct {. GaugeVecFunc that is a prometheus. @Scheduled(fixedDelay = 5000) public void increaseCounter() { ordersCreatedCounter. Collector, i. quantile suffix. 2: An open-tube manometer has one side open to the atmosphere. tags("example", "list size") . The workers expose metrics via http that gets scraped. For Prometheus/OpenMetrics summary, _count and _sum values are mapped to Datadog’s count type and include a . E. Or use the global Metrics. 3. All count metrics are processed by the Agent as monotonic counts, meaning the Agent actually sends the Dec 23, 2020 · 2. Still doesn't work. The code is much more complicated with an async gauge than a synchronous gauge since we just want to issue it once and right at the end of the test run, and because we're in a Lambda and need to make sure it emits while the Lambda is running. Here is my code. There's no potential for messing around with moving averages or resets, as there is with counters. Here's a code snippet where I'm incrementing a counter (which works) and attempts to set a couple of gauges (which doesn't work): @Scheduled (cron = "*/2 * * * * *") // run every 2 seconds private void logTemperature () throws UnknownHostException We would like to show you a description here but the site won’t allow us. 0 is reported. Put simply, metrics are important to monitor the health of your system Mar 18, 2021 · Prometheus is an open source monitoring and alerting tool that helps us to collect and expose these metrics from our application in an easy and reliable way. Some Prometheus functions are specifically implemented and optimized to be used for counters - rate, irate etc. Proposal: Mar 19, 2019 · Prometheus metrics libraries have become widely adopted, not only by Prometheus users, but by other monitoring systems including InfluxDB, OpenTSDB, Graphite, and Sysdig Monitor. Feb 5, 2021 · Published 5 Feb 2021 · 5 min read · Tom Gregory. Ok, so seems it was easier than I thought (if only I was familiar with go-lang before approaching this task). Histogram. I had to declare the label where I was calling the NewDesc method and then pass the value within the MustNewConstMetric method Python Gauge. The increase() function in Prometheus may return fractional results for Sep 17, 2021 · I have a gauge in Prometheus which has a single label &quot;zipcode&quot;, in order to track access to the application from various zipcodes. Dec 26, 2016 · The Prometheus gauge is essentially the same simple idea as gauges in other monitoring systems. The same expression, but summed by application, could be written like this: Metric and label naming. set(4. ClientMetric In addition to the fundamental metric types Gauge, Counter, Summary, Histogram, and Untyped, a very important part of the Prometheus data model is the partitioning of samples along dimensions called labels, which results in metric vectors. Instead you should be registering the metric to the Prometheus registry (or the CompositeMeterRegistry) You can inject the MeterRegistry if this is a Spring project. A Registry that Metric s are registered with. georgelza March 31, 2023, 9:44am 5. this batch job, can run under a second at times (mostly)/couple of seconds, to a couple of minutes (horror situation then), G. Jun 8, 2023 · I have a gauge metric, A, that has a label name. Examples of gauge metrics include CPU usage, memory usage, and disk usage. In some scenarios you may want to only collect data when it is requested by Prometheus. GaugeVec, data *evictionData) { data. NewGauge(. However, there is always a caveat. 而Server端是不区分数据类型的，因为所有的数据都是一种 The CloudWatch agent with Prometheus support discovers and collects Prometheus metrics to monitor, troubleshoot, and alarm on application performance degradation and failures faster. The metric and label conventions presented in this document are not required for using Prometheus, but can serve as both a style-guide and a collection of best practices. A histogram samples observations (usually things like request durations The Prometheus client libraries offer four core metric types: Counter. It seems to expire after 5 minutes. "increase (v range-vector) : calculates the increase in the time series in the range vector. Filter results by the prometheus measurement and counter metric name field. Ideal for tracking the number of requests, tasks completed, or errors. Labels. private Map<String, Integer> gaugeCache = new HashMap<>(); private InfoCollectionService infoService; public MonitorService I wrote an exporter that can connect to RMQ in one namespace, read the statistics and expose them on the /metrics so Prometheus can read it. Gauge is the far more commonly used word. Use derivative() to calculate the rate of change between gauge values. In all other cases, ToFloat64 panics. If you are exposing the metrics the first time then start with important metrics. This post will go For example, if you want to count all connected devices and you don't care about the different types, use a Gauge. In this guide, you created two sample Go applications that expose metrics to Prometheus---one that exposes only the default Go metrics and one that also exposes a custom Prometheus counter---and configured a Prometheus instance to scrape metrics from those applications. Gauge指标的值可以随时间变化，可以增加也可以减少 Jan 29, 2020 · Prometheus currently only uses the first metric it reads, which is non-deterministic due to iteration over the registry's dictionary. Starting with Prometheus 2. These are the top rated real world Python examples of prometheus_client. Prometheus is a “time series DBMS and monitoring system,” while Graphite is a simpler “data logging and graphing tool for time series data. As a verb, gauge can mean: “to determine the exact dimensions, capacity, quantity, or force of; measure”. Oct 27, 2018 · I figured it out. The gauge metric type can be used for Type Definition prometheus :: GaugeVec⎘[ −] [src] A Collector that bundles a set of Gauge s that all share the same Desc, but have different values for their variable labels. Adjust the sizes of the gauge text. customMetricsOne *prometheus. Empty name components are ignored. sum suffix in their name, respectively. Called when the Prometheus server scrapes metrics. And the sum of these increase will match the actual counter. The Rust client library for Prometheus. globalRegistry to get the composite one. It goes into the meaning of each type, explai Feb 2, 2021 · Prometheus整体架构分为Server端和Exporter端，而Exporter通常是基于官方的SDK开发（例如Go SDK）。. You're looking for subqueries: The outermost query avg_over_time(query[10h:1h]) will evaluate a time period for 10h back, execute the query at 1h interval and then average those 10 results for each time series. GaugeVec. Gauge. Help: "Total slave CPUs (fractional)", Reset the metric (remove all data points). In Part 1 of this series, we talked about Prometheus metrics and how to make good use of labels to observe your applications under different segments and dimensions. From Prometheus' point, metric will be there as long as it is exposed and scraped (+5 minutes if your app died or stopped responding for other reasons). Initialized bool. This also reduces the number of monitoring tools required to improve observability. 6. These metric types fulfill the needs or requirements for most use cases, and are found in Prometheus’ official client gaugevecfunc. Gauges. You signed out in another tab or window. Sep 12, 2023 · 3,820 9 51 86. What we want is to display the "latest" value for the gauge x regardless of worker. var MemoryValue = prometheus. That means your service always returns to Prometheus the current value of whatever it is you’re measuring. customMetricsTwo *prometheus. Still, it also supports traces and logs with the same SDK. Jun 28, 2021 · min, max, avg, sum, stddev, stdvar over time. avg_over_time({__name__ May 9, 2024 · Keeping the Gauge for later use is possible (and should be considered if performance is critical), but keep in mind that Reset, DeleteLabelValues and Delete can be used to delete the Gauge from the GaugeVec. } func newCustomMetrics() (m *customMetrics) {. With Micrometer you can create Gauge from the object method you want to check for example from baeldung: . Although we’ll be looking at the Java version in this article, the concepts you’ll learn will translate to the other languages too. func (*Gauge) Add ¶ added in v0. increment(); } Refreshing the Prometheus query, we can see that the value increases as expected. Sep 25, 2020 · For the longest time, the Prometheus server simply threw away any metric type (and documentation string) metadata when it scraped time series from a target. register(registry); It takes a string "cache. The fundamental types are GaugeVec, CounterVec, SummaryVec, HistogramVec, and UntypedVec. Jul 14, 2023 · A Gauge in Prometheus, ladies, and gentlemen, is something of a capricious character. Apr 7, 2019 · 1. Sep 12, 2023 at 7:31. ”. If anyone needs it, prometheus-net provides the AddBeforeCollectCallback callback for collecting or updating your metrics, gauges, etc. Labels labels) Add amount, and create a custom exemplar with the given labels. Apr 1, 2022 · 2. a snapshot value-reporting metric. I’ve try to delete serie like this : remove scrap from config restart prometheus delete serie from api Jun 25, 2022 · Sometimes sends the Reason tag and sometimes not. Standard options. set_to_current_time() # Set to current unixtime # Increment when entered, decrement when exited. help("A simple gauge"s); To set the value of a Gauge (without labels): simpleGauge. The changes() function in Prometheus can be used instead of increase() function if you are sure that the counter stays the same or is incremented by 1 between scrapes. rr hz sw vu ld bq xi fp tn np