This should work:
- job_name: blackbox
file_sd_configs:
- files:
- /etc/prometheus/blackbox.d/*.yml
metrics_path: /probe
relabel_configs:
- source_labels: [__address__]
target_label: __param_target
- source_labels: [module]
target_label: __param_module
- target_label: __address__
replacement: 127.0.0.1:9115 # Blackbox exporter
That is, you set a label "module" in your targets file, and it gets copied
to __param_module. Your targets files /etc/prometheus/blackbox.d/foo.yml
look like this:
- labels:
module: icmp
targets:
- 1.1.1.1
- 2.2.2.2
- labels:
module: dns
targets:
- 3.3.3.3
... etc
All your blackbox scrapes are done in a single job.
The actual config I use is a little more complex than that:
- job_name: blackbox
file_sd_configs:
- files:
- /etc/prometheus/blackbox.d/*.yml
metrics_path: /probe
relabel_configs:
- source_labels: [__address__]
regex: '([^/]+)' # name or address only
target_label: instance
- source_labels: [__address__]
regex: '([^/]+)' # name or address only
target_label: __param_target
- source_labels: [__address__]
regex: '(.+)/(.+)' # name/address
target_label: instance
replacement: '${1}'
- source_labels: [__address__]
regex: '(.+)/(.+)' # name/address
target_label: __param_target
replacement: '${2}'
- source_labels: [module]
target_label: __param_module
- target_label: __address__
replacement: 127.0.0.1:9115 # Blackbox exporter
This lets me use target entries of the form
"<instance-label>/<address-or-hostname>", e.g.
- labels:
module: icmp
targets:
- google-primary/8.8.8.8
- google-secondary/8.8.4.4
so my metrics have meaningful instance labels
<https://www.robustperception.io/controlling-the-instance-label>.
On Friday, 6 August 2021 at 10:17:06 UTC+1 Sebastian N. wrote:
> Hey guys,
>
> In the following discussion
> <https://groups.google.com/g/prometheus-users/c/a0uePOVkG1c/m/4u0NwDN5AwAJ>
> about the blackbox exporter Julius Volz mentioned the following:
>
> The Blackbox targets to probe (like "https://google.com";) can come from
> file_sd (or any other SD), no problem. You still need a scrape config in
> the Prometheus config that actually scrapes the Blackbox exporter, but it
> can get targets to probe from file_sd. *You can even vary the Blackbox
> Exporter probe module to use for each target by setting a "__param_module"
> hidden label on each target to override any "module" HTTP param that is set
> in the scrape config itself.*
>
> During my research I have not found an example that shows me how I can
> override module parameters on a per-target basis. My use case is that I'd
> like to set a different user agent or toggle the follow_redirects flag for
> some hosts without having to create another scraping job for that.
>
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