[PATCH proxmox-backup 2/4] move group: split overly long error message

["Fabian Grünbichler" <f.gruenbichler@proxmox.com>]

this is now logged as

2026-04-27T13:49:49+02:00: oldest source snapshot: 2023-03-15T08:00:13Z
2026-04-27T13:49:49+02:00: conflicting target snapshot: 2026-03-24T10:27:24Z
2026-04-27T13:49:49+02:00: TASK ERROR: cannot merge group 'ct/999' from 'foo' into 'bar': snapshot time overlap

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
---
 pbs-datastore/src/backup_info.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pbs-datastore/src/backup_info.rs b/pbs-datastore/src/backup_info.rs
index 5f61890ed..8a650b57c 100644
--- a/pbs-datastore/src/backup_info.rs
+++ b/pbs-datastore/src/backup_info.rs
@@ -8,6 +8,7 @@ use std::time::Duration;
 
 use anyhow::{bail, format_err, Context, Error};
 use const_format::concatcp;
+use tracing::info;
 
 use proxmox_s3_client::{S3ObjectKey, S3PathPrefix};
 use proxmox_sys::fs::{lock_dir_noblock, lock_dir_noblock_shared, replace_file, CreateOptions};
@@ -317,9 +318,10 @@ impl BackupGroup {
                     }
                 })
             {
+                info!("oldest source snapshot: {src_oldest_str}");
+                info!("conflicting target snapshot: {overlap}");
                 bail!(
-                    "cannot merge group '{}/{}' from '{}' into '{}': snapshot time overlap \
-                    (oldest source: {src_oldest_str}, conflicting target: {overlap})",
+                    "cannot merge group '{}/{}' from '{}' into '{}': snapshot time overlap",
                     self.group.ty,
                     self.group.id,
                     self.ns,
-- 
2.47.3