How to access variable, passed through URL in grafana? - grafana

I am trying to make a detailed dashboard in grafana that opens on click. I do it by passing a variable to the dashboard debending on the clicked facility. When the dashboard opens it needs to display value using the passed url variable inst. I just cannot seem to get it working. Here is an example of my dashboard link.
How can i use the variable inst?


I will add gogibogi4's correct answer. The Grafana documentation is lacking on this.
In your drill-down dashboard, add a constant variable. To be retrieved in Grafana, you need the prefix var- then the name of the variable in the query string. Let's assume the variable is "region." The URL coming into the drilldown dashboard should look similar to the following:
/drilldowndashboard/?var-region=NorthWest
Drilldown Dashboard Settings:
In the drilldown dashboard settings, create a variable. The Name in this example is "region" Make the type Constant. Under Hide, you can just leave that unselected. Under Constant options, you can write the word "blank" The preview of values will just show the word "blank" but go ahead and save it as it will be replaced in the query.
Query:
You can refer to the variable using [[region]] in your data query.
Parent Dashboard:
The parent dashboard merely needs to refer to the drilldown dashboard with var-region as a query parameter.


I figured out the solution on my own. The variable that i wanted to pass was var-inst, the trick to use it is to create a custom template variable named inst and give it a dummy value. After that is done i can use the passed value by using $inst. Note that in order for the variable to be passed i had to go back to my primary dashboard and then i had to click my link again. After that the value got passed and is working perfectly.


just referred above answer by gogibogi4 and it worked for me but when I tried to see variable information then I saw I have selected constant as a type but automatically it got converted into datasource and type is selected grafana. when I try to select them manually it didn't worked. this is some kind of bug of grafana I guess.

Related

Grafana Geomap: How to use variables in a "Data link" external URL

I have a working geomap in Grafana, but I cannot set up a Data link that utilizes variables in the given entry.
The variables are NOT expanded at all, even if pressing "$" show a list of possible variables indeed.

Create a variable in Prometheus/Grafana with all values selected by default

I'm using Grafana with Prometheus as a Datasource.
I'm trying to create a variable with a filtered list of servers and I want to use this list to fix list of servers to display in my Dashboard.
My variable, named servers_front, is a query (label_values(info_fqdn)) with a regex to choose my servers /.*_front/
I want to use this full list of servers by default without displaying a combobox to choose which one I want to display.
Another requirement : If a new server that matches /.*_front/ is created, I want the list is automatically updated

Edit the variable
Variables > Edit > Selection Options >enable Include All option >Custom all value>.*

When saving dashboard you have an option to "save current variables", which means that currently selected value will be stored as a default when dashboard is loaded.
So if you have a templating variable with enabled "All" option you can save your dashboard ensuring "All" is selected (with option mentioned above enabled) and it should work.
Note that what is stored in dashboard is real "all" option and not an expanded list of all currently present values, so it should be dynamically expanded.
If you want that variable hidden then either you can hide the variable and save again after changing and saving its value or (if you have variable hidden from the start you can open url for dashboard with "&var-servers_front=All" appended (which will force variable to have "All" value and save dashboard with "save current variables".

How to hide panel by specific condition in grafana

I want to hide some panel by specific condition in graphana.
For instance, I have some variable in my dashboard and I want to change visibility of some graph if my variable is equal to some specific value.
Is there any way to do this?
UPD: Using repeat panel option is not solution in my case, because this option just dynamically creates new panels. But I want to hide some panel by specific value of my variable, if variable is not equal to this value then the panel should not be hidden.

I dont see an option to hide/show a panel with template variable, but instead you can create two dashboards and use dashboard links.
For example:
First Dashboard (Type A)
Second Dashboard (Type B)
Create a Dashboard link "Type B" in First Dashboard pointing to second Dashboard.
Similarly Create a Dashboard link "Type A" in Second Dashboard and point it to First dashboard.
Settings -> Link -> New Link -> Choose "Include time range" & "Include template variable value"
I have actually used this option because mine was just two variables so it was duplicating the dashboard to two and linking eachother.
If it is multiple values to show/hide, i recommend to achieve it via repeat options some how linking that variable in your query.

How do I write a Prometheus query that returns the value of a label?

I'm making a Grafana dashboard and want a panel that reports the latest version of our app. The version is reported as a label in the app_version (say) metric like so:
app_version_updated{instance="eu99",version="1.5.0-abcdefg"}
I've tried a number of Prometheus queries to extract the version label as a string from the latest member of this time series, to no effect.
For example, the query
count(app_version_updated) by (version)
returns a {version="1.5.0-abcdefg"} element with a value of 1. When put in a Grafana dashboard in a single value panel, this doesn't display the version string but instead the count value (1).
How can I construct a Prometheus query that returns the version string?

My answer tries to elaborate on Carl's answer. I assume that the GUI layout may have changed a little since 2016, so it took me while to find the "name" option.
Assuming you have a metric as follows:
# HELP db2_prometheus_adapter_info Information on the state of the DB2-Prometheus-Adapter
# TYPE db2_prometheus_adapter_info gauge
db2_prometheus_adapter_info{app_state="UP") 1.0
and you would like to show the value of the label app_state.
Follow these steps:
Create a "SingleStat" visualization.
Go to the "Queries" tab:
Enter the name (here db2_prometheus_adapter_info) of the metric.
Enter the label name as the legend using the {{[LABEL]}} notation (here {{app_state}}).
Activate the "instant" option.
Go to the "Visualization" tab:
Choose the value "Name" under "Value - Stat".
Note on the "Instant" setting: This setting switches from a range query to a simplified query only returning the most recent value of the metric (also see What does the "instant" checkbox in grafana graphs based on prometheus do?). If not activated, the panel will show an error as soon as there is more than one distinct value for the label in the history of the metric. For a "normal" metric you would remedy this by choosing "current" in the "Value - Stat" option. But doing so here prevents your label value to be shown.

We recently added support for displaying the serie name as a value in the single stat panel (https://github.com/grafana/grafana/issues/4740). So you have to run our nightly build until we release 4.0.
Just make sure the query returns one serie and you can use the "name" value in the dropdown under Options -> big value.Then you can format the string using the legend formater. Ex {{job}} would return "node" as a serie name.
I hope this answers your question.

While most of #marcus-rickert's answer is still valid in Grafana 7, there is some change.
The 'Stat' 'Name' field seems to be gone, instead in the 'Field' panel, you can set the 'Display name' to the label you want to show.

This worked for me.
label_values(my_metric{type= "xxx", another_label="xxx"},target_label)

With Stat visualization in Grafana 8+, you can set the legend to the intended label name and then change the Stat Styles -> Text Mode to Name

Prometheus doesn't have any functions that return strings, what you're looking for is for a Grafana singlestat to be able to display a label value - which it unfortunately doesn't support yet.
https://github.com/grafana/grafana/issues/5094 tracks this.

Another update on very latest kube-prometheus-stack using grafana 8.0.3. I still faced this issue, for me in a Bar gauge I still had this issue in scenarios where it only returned 1 value, but with 2+ values the Legend field works OK.
My solution:
Go to Edit Panel, find Display Name, type
${__field.labels.insertYourLegendValueHere}

I wanted to get all the various values of a label from Prometheus to put into a variable in Grafana. I used this simple query to populate my varialbe Drop-Down list:
label_values(myLabelName)
This returned the expected "value01", "value02" etc

How to add a non editable field using install4j - value of this is not static and should be displayed from a user defined variable

I would like to be able to add a key/value pair label in an install screen. The key is a static text. The value is a dynamic value and a value from a variable should be used to display the value label. I'm not able to do so using install4J. I see options like a textArea, textfield that will enable to be able to do so. However, these are editable fields and does not serve my purpose. I want a non editable field to display a value from a variable. This is not a system variable. This should be a user defined variable. I'm using install4j 4.2 version. Any help in this area is highly appreciated.
Thanks for the response. I was able to create key/value pair. However, I'm not able to define my own installer variable. Can you please let me know where I can define an installer variable that can be used in the key/value pair?

There is a "Key value pair" form component that does exactly what you need. It is available in install4j 4.2.
In the "Value label/Text" property, you can use an installer variable like
${installer:myValue}
for displaying dynamic text.