Is there any possible that provide a new metrics which calculate index store size total by aliase?

[max-tian]

Sometimes, there are many indices which grouped by versioning (naming convention). When I use metrics elasticsearch_indices_store_size_bytes_total for monitoring index store size, I only want to know the current using index(not old versions). In that case, the current using index has an alias. The old index doesn't have. If there is such label in this metrics. I could use it as following:
elasticsearch_indices_store_size_bytes_total{alias="my-alias"}
Since the index name will be changed automatically, I don't need to change the index name in this metrics. Thus, I don't need to change the query expression again and again.

[shani-e]

It's will be very helpful!!

[jorgelbg]

This is not exactly per alias, but it could help to get the desired data (for anyone hitting this in the future). We can use the label_replace function to extract the interesting part from the index name and group by that.

For instance, with daily indices, we always have something like: my-index-2024.02.02. In this case, we want to aggregate the common part of all those indices (my-index).

sum by (pattern) (
    label_replace(
        sum by (index) (
            elasticsearch_indices_store_size_bytes_total
        ),
        "pattern",
        "$1",
        "index",
		"(.*)_[0-9]{4}\\.[0-9]{2}\\.[0-9]{2}$"
    )
)

You may need to tweak the regex to extract the pattern from the index label.

[sysadmind]

You should be able to enable alias metrics --es.aliases and then use something like group_left() to get the label on the index query

https://prometheus.io/docs/prometheus/latest/querying/operators/#group-modifiers