marsadm: hint on wasted disk space

docu/mars-manual.lyx

@@ -6577,7 +6577,8 @@ marsadm view mydata
 \emph default
  suffix.
  It shows a one-line status summary for each resource, optionally followed
- by progress bars whenever a sync or a fetch of logfiles is currently running.
+ by informational lines such as progress bars whenever a sync or a fetch
+ of logfiles is currently running.
  The status line has the following fields:
 \end_layout
 
@@ -6670,6 +6671,25 @@ commstate
 \end_layout
 
 \end_deeper
+\begin_layout Labeling
+\labelwidthstring 00.00.0000
+\begin_inset space ~
+\end_inset
+
+ After that, optional lines such as progress bars are appearing only when
+ something unusual is happening.
+ These lines are subject to future changes.
+ For examples, wasted disk space due to missing 
+\family typewriter
+resize
+\family default
+ is reported when 
+\family typewriter
+%{threshold}
+\family default
+ is exceeded.
+\end_layout
+
 \begin_layout Labeling
 \labelwidthstring 00.00.0000
 

userspace/marsadm

@@ -3461,6 +3461,9 @@ my %complex_macros =
    "default"
    => "%if{%{res}}{"
    .    "  %{res} %include{diskstate} %include{replstate} %include{flags} %include{role} %include{primarynode} %include{commstate}\n"
+   .    "%if{%>{%-{%disk-size{}}{%resource-size{}}}{%{threshold}}}{"
+   .    "     Hint: you are wasting %human-numbers{}{ }{ }{%-{%disk-size{}}{%resource-size{}}} on disk %get-disk{}\n"
+   .    "}"
    .    "%if{%and{%is-attach{}}{%not{%sync-reached{}}}}{"
    .      "%include{syncinfo}"
    .    "}"