r/recovery_stm: log taking on demand snapshot at info level

When on demand snapshot is taken it may be helpful to check the
difference between configured learner start offset and current leader
start offset.

Signed-off-by: Michał Maślanka <michal@redpanda.com>

src/v/raft/recovery_stm.cc

@@ -20,6 +20,7 @@
 #include "raft/raftgen_service.h"
 #include "ssx/sformat.h"
 #include "storage/snapshot.h"
+#include "utils/human.h"
 
 #include <seastar/core/condition-variable.hh>
 #include <seastar/core/coroutine.hh>
@@ -454,9 +455,14 @@ ss::future<> recovery_stm::install_snapshot(required_snapshot_type s_type) {
 ss::future<>
 recovery_stm::take_on_demand_snapshot(model::offset last_included_offset) {
     vlog(
-      _ctxlog.debug,
-      "creating on demand snapshot with last included offset: {}",
-      last_included_offset);
+      _ctxlog.info,
+      "creating on demand snapshot with last included offset: {}, current "
+      "leader start offset: {}. Total partition size on leader {}, expected to "
+      "transfer to learner: {}",
+      last_included_offset,
+      _ptr->start_offset(),
+      human::bytes(_ptr->log()->size_bytes()),
+      human::bytes(_ptr->log()->size_bytes_after_offset(last_included_offset)));
 
     _inflight_snapshot_last_included_index = last_included_offset;
     // if there is no stm_manager available for the raft group use empty