Multi-Target Python Exporter

[Sebastian Halter]

Hello everyone,

i am trying to collect some data via TL1 (basically telnet) because the manufacturer doesn't provide the temperature of the installed cards via SNMP.

I would like to recreate something like the SNMP-Exporter where i can specify my target in the URL it scrapes. Currently i am facing the issue, that my exporter runs once and then it runs into an error on every other request ("ValueError: Duplicated timeseriers in CollectorRegistry").

Does anyone have a basic example of a multi-target python exporter? 

I found in the documentation that python, go und java are the only client libraries that supports this approch but couldn't find any example of this on the python-client github site.

[Ben Kochie]

You probably need to use the Custom Collector. This is similar to the "Const" metrics in the Go code.

https://github.com/prometheus/client_python#custom-collectors

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[Sebastian Halter]

Thats what i tried:

g = GaugeMetricFamily("cardTemperature", "Temperature of the installed card", labels=["card"])

class TL1Collector(object):

    def __init__(self, endpoint):

        self._endpoint = endpoint

   

    def collect(self):

        g.add_metric(self._endpoint, 2)

        yield g

@app.route("/temperature")

def handle_get():

    if "target" in request.args:

        target = request.args.get('target')

        REGISTRY.register(TL1Collector(target))

        return generate_latest(REGISTRY)

    else:

        return "Error: No target field provided. Please specify target."

I'm probably wrong the line "REGISTRY.register(TL1Collector(target))"  because i register the collector every time i call the endpoint and it is already registered from the http call before that one.

But i don't know where to register the custom collector to prevent that, because i need the target variable to be passed through.

If i only trigger it once at the start with a boolean it works serveral times and i dont get that error anymore but in only adds another metric to the output an keeps the old data from a different target parameter aswell.

[Brian Brazil]

On Tue, 22 Sep 2020 at 11:06, Sebastian Halter <halter.se...@gmail.com> wrote:

Thats what i tried:

g = GaugeMetricFamily("cardTemperature", "Temperature of the installed card", labels=["card"])

This should be inside the collector.

 

class TL1Collector(object):

    def __init__(self, endpoint):

        self._endpoint = endpoint

   

    def collect(self):

        g.add_metric(self._endpoint, 2)

        yield g

@app.route("/temperature")

def handle_get():

    if "target" in request.args:

        target = request.args.get('target')

        REGISTRY.register(TL1Collector(target))

Create a registry per request, and register with that.

Brian

 

        return generate_latest(REGISTRY)

    else:

        return "Error: No target field provided. Please specify target."

I'm probably wrong the line "REGISTRY.register(TL1Collector(target))"  because i register the collector every time i call the endpoint and it is already registered from the http call before that one.

But i don't know where to register the custom collector to prevent that, because i need the target variable to be passed through.

If i only trigger it once at the start with a boolean it works serveral times and i dont get that error anymore but in only adds another metric to the output an keeps the old data from a different target parameter aswell.

sup...@gmail.com schrieb am Dienstag, 22. September 2020 um 11:31:43 UTC+2:

You probably need to use the Custom Collector. This is similar to the "Const" metrics in the Go code.

https://github.com/prometheus/client_python#custom-collectors

On Tue, Sep 22, 2020 at 11:03 AM Sebastian Halter <halter.se...@gmail.com> wrote:

Hello everyone,

i am trying to collect some data via TL1 (basically telnet) because the manufacturer doesn't provide the temperature of the installed cards via SNMP.

I would like to recreate something like the SNMP-Exporter where i can specify my target in the URL it scrapes. Currently i am facing the issue, that my exporter runs once and then it runs into an error on every other request ("ValueError: Duplicated timeseriers in CollectorRegistry").

Does anyone have a basic example of a multi-target python exporter? 

I found in the documentation that python, go und java are the only client libraries that supports this approch but couldn't find any example of this on the python-client github site.

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Brian Brazil

www.robustperception.io

[Sebastian Halter]

Hi Brian,

thank you for you replay.

The first thing with "GaugeMetricFamily"  I figured out just a few minutes after my first reply.

To the second thing you pointed out:

Can you give me an example for how to create a registry per request?

If i try to use "req = REGISTRY()"  i get the error "'CollectorRegistry' object is not callable".

[Sebastian Halter]

It's working now:

registry = CollectorRegistry()

registry.register(CustomCollector(target))

Thank you for your help!