Add the Valkey keys_with_volatile_items keyspace metric

Elastic Stack Beats
1

Valkey ≥ 9.0 reports a per-database keys_with_volatile_items counter in INFO keyspace that
Metricbeat's redis.keyspace metricset does not collect. Please add it as
redis.keyspace.keys_with_volatile_items (long), alongside the existing keys, expires, and
avg_ttl. It is the Valkey analogue of the subexpiry field added for Redis ≥ 7.4 in #47971.

Example INFO keyspace line on Valkey ≥ 9.0:

db0:keys=1000,expires=200,avg_ttl=0,keys_with_volatile_items=0
                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Implementation: add the field (optional) to the keyspace schema in
metricbeat/module/redis/keyspace/data.go and to _meta/fields.yml. On main the parser already
accepts the 4-field line (post-#47971), so this is purely additive:

var schema = s.Schema{
	"keys":                     c.Int("keys"),
	"expires":                  c.Int("expires"),
	"avg_ttl":                  c.Int("avg_ttl"),
	"subexpiry":                c.Int("subexpiry", s.Optional),                // Redis >= 7.4
	"keys_with_volatile_items": c.Int("keys_with_volatile_items", s.Optional), // Valkey >= 9.0
}

While here, consider replacing the len(dbInfo) == 3 || len(dbInfo) == 4 guard in
parseKeyspaceStats with len(dbInfo) >= 3, so future keyspace fields don't need another patch —
the parser is name-based and the schema only extracts fields it knows.

Describe a specific use case for the enhancement or feature:

Monitoring Valkey / ElastiCache 9.0 with Metricbeat — surfacing the per-database
keys_with_volatile_items counter next to the other redis.keyspace stats.

Note: on releases before #47971 (8.19.x–9.3.x) the keyspace metricset drops all events on
Valkey ≥ 9.0, which is why this field currently can't be collected there. That regression is
tracked separately.

2

Hello and welcome,

Did you open an issue in Github? The forum is more for questions, for these kind of requests the right channel would be opening a Feature Request Issue in the repository.

3

Yes. However, due to inactivity there I checked the CONTRIBUTING.md, and linked contributing guidelines which states:

If you have a bugfix or new feature that you would like to contribute, please start by opening a topic on the forums.

Issue: [Metricbeat][Redis] Add the Valkey keys_with_volatile_items keyspace metric · Issue #52179 · elastic/beats · GitHub

PR: [Metricbeat][Redis] Add the Valkey keys_with_volatile_items keyspace field by aglowienka · Pull Request #52181 · elastic/beats · GitHub