Promtheus custom exporter using prometheus python client

[kavya KULSHRESHTHA]

Hi,

I have created an exporter for checking health of various applications using API exposed by these applications.
Workflow:

1.  A csv file is created with details about various application's host/ports/API URL etc.
2. This custom exporter reads the file at a certain interval and gets the health check return code

Problem: Whenever there is a new config added, new metrics are exposed by the exporter. But in case a config is updated in CSV, the exporter along with new health check gives the result for the old data as well.

Gauge Definition

g = Gauge('healthcheck', 'Metrics generated by Health Check exporter', [
        'customer',
        'application',
        'component',
        'version',
        'description',
        'source_host_name',
        'target_host_name',
        'target_host_port',
        'environment'
])

Gauge set value:

    g.labels(
        chs['customer'],
        chs['application'],
        chs['container'],
        chs['version'],
        chs['description'],
        chs['nehost'],
        chs['hostname'],
        chs['port'],
        chs['environment']
    ).set(value)

Enter code here...

Regards,

Kavya K

[Brian Brazil]

On 27 December 2017 at 09:40, kavya KULSHRESHTHA <kavya.kul...@gmail.com> wrote:

Hi,

I have created an exporter for checking health of various applications using API exposed by these applications.
Workflow:

1.  A csv file is created with details about various application's host/ports/API URL etc.
2. This custom exporter reads the file at a certain interval and gets the health check return code

Problem: Whenever there is a new config added, new metrics are exposed by the exporter. But in case a config is updated in CSV, the exporter along with new health check gives the result for the old data as well.

Use a custom collector that scrapes the data on each Prometheus scrape: https://github.com/prometheus/client_python#custom-collectors

Have you considered the blackbox exporter for this?

 

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Brian Brazil

www.robustperception.io

[kavya KULSHRESHTHA]

Thanks, I will try using this.
Yes, I read about blackbox exporter but there is a requirement that in case certain heath check fails its response JSON body has to be read and then metrics needs to be created from them.

By the way, does blackbox exporter provides flexibility to pass different headers for a single probe? As we have multiple applications which needs different headers.


Regards,
Kavya K

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Brian Brazil

www.robustperception.io

[Brian Brazil]

On 27 Dec 2017 11:11, "kavya KULSHRESHTHA" <kavya.kul...@gmail.com> wrote:

Thanks, I will try using this.
Yes, I read about blackbox exporter but there is a requirement that in case certain heath check fails its response JSON body has to be read and then metrics needs to be created from them.

By the way, does blackbox exporter provides flexibility to pass different headers for a single probe? As we have multiple applications which needs different headers.

You can set headers per module.

Brian

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