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container stats: measure agent disk usage through hive-priv, unknown on failure

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The disk sampler ran `du -sxb` as the unprivileged hive-core user over
each agent's state/, work/ and container rootfs. hive-core cannot read
the rootfs or all of the agent-owned files, so `du` failed and each
failed path silently counted as 0: the dashboard showed a few MB for
agents using over 13 GB.

Add a hive-priv `MeasureAgentDisk { agent_name }` op. hive-priv
validates the name, derives the three paths itself (the request carries
no path), skips the ones that don't exist, and runs one
`du -s -x -b -c -P` as root with a 10 min timeout. A timeout, a non-zero
exit or output without a `total` line is an error.

hive-c0re calls it every 30 min instead of running `du` every 5 min:
each pass walks every agent's full tree as root on the disk the agents
work on, and the sizes move slowly. A failed measurement is cached as
None, so `disk_bytes` is null, the OTel storage.usage sample is omitted
and the dashboard shows "unknown", never 0.

`Coordinator::agent_work_dir` had no other caller and is removed.

Closes #4956
This commit is contained in:
atlas 2026-10-05 16:12:33 +02:00 • committed by mara
commit 98ccc31e2b
10 changed files with 244 additions and 179 deletions
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19
hive-c0re/src/priv_client.rs
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@ -429,6 +429,25 @@ pub async fn read_subvolume_usage(agent_name: &str) -> Result<(u64, u64)> {
parse_qgroup_usage(&stdout).with_context(|| format!("parse qgroup usage for {agent_name}"))
}
/// Measure an agent's disk usage in bytes (`state/` + `work/` + container
/// rootfs, one bounded `du` run by hive-priv as root).
///
/// # Errors
/// Returns an error if the hive-priv call fails, the `du` walk times out or
/// exits non-zero, or the returned total isn't a number.
pub async fn measure_agent_disk(agent_name: &str) -> Result<u64> {
let (stdout, _) = check(
call(&PrivRequest::MeasureAgentDisk {
agent_name: agent_name.to_owned(),
})
.await?,
)?;
stdout
.trim()
.parse()
.with_context(|| format!("parse disk usage for {agent_name}: {stdout:?}"))
}
/// Set or clear a btrfs qgroup size limit on an agent's state subvolume.
/// `limit_bytes = None` clears it. Requires quota enabled. Via hive-priv.
///