what is the use case of external_labels in promethues.yml

[kiran]

Hello all

Can anyone guide me on what is the use of external_labels in prometheus.yml file? From the documentation I am assuming it adds a new label for each metric when let's say we remote_write to external storage systems. Is my assumption correct? If so then can this help identify tenants in a multi-tenant setup? 

[Brian Candler]

It adds new labels to each metric for remote_write, alerts, and when exposing data through federation.

However it's a global setting, so it will only help you for a multi-tenant setup if each tenant has their own prometheus instance.

[Ben Kochie]

In addition to what Brian said a typical use case is also for identifying HA replica pairs.

Systems like Thanos can know about replicas, and provide de-duplication.

On Thu, Sep 17, 2020 at 6:46 AM kiran <kira...@gmail.com> wrote:

Hello all

Can anyone guide me on what is the use of external_labels in prometheus.yml file? From the documentation I am assuming it adds a new label for each metric when let's say we remote_write to external storage systems. Is my assumption correct? If so then can this help identify tenants in a multi-tenant setup? 

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