here's some additional context -
the following metrics are exported by the node exporter via text file:
custom_metrics_from_server{ source="server1.example.com",status="run" }
3213
custom_metrics_from_server{ source="server1.example.com",status="pend" }
3215
hence they have source= label, whereas rest of the metrics are collected
from the system by node exporter. i.e.
node_cooling_device_max_state{name="7",type="Processor"} 0
On Tuesday, March 11, 2025 at 11:09:58 PM UTC+5:30 mohan garden wrote:
> Hi Everyone,
>
> I need to handle a scenario where I add a label to ingested metrics, but
> only if the label does not already exist in the collected data. If the
> label is present in a metric, it should remain unchanged.
>
> For example, given a set of metrics:
>
> custom_metrics_from_server{ source="server1.example.com",status="run" }
> 3213
> custom_metrics_from_server{ source="server1.example.com",status="pend" }
> 3215
>
> When additional metrics are collected from a node exporter, some will
> already have a "source=" label, while others will not:
>
> custom_metrics_from_server{ source="server1.example.com",status="run" }
> 3213
> custom_metrics_from_server{ source="server1.example.com",status="pend" }
> 3215
> node_cooling_device_max_state{name="7",type="Processor"} 0
>
> To ensure that all metrics contain the "source=" label without overriding
> existing ones, I figured the following approach using honor_labels and
> relabel_configs:
>
> honor_labels: true
> relabel_configs:
> - source_labels: [ _address_ ]
> regex: "(.*):(.*)"
> target_label: "source"
> replacement: '${1}'
>
> Is this the best way to handle this, or is there a more optimal approach?
> Please advice.
>
> Thanks!
>
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