[PATCH v4 4/7] usertools/telemetry-watcher: add total and one-line opts

[Bruce Richardson <bruce.richardson@intel.com>]

Add options to the script to print out totals at the end of each line,
and to print each line replacing the previous one, saving the output
scrolling up the screen constantly.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
---
 doc/guides/tools/telemetrywatcher.rst | 27 +++++++++++++++++++++++++++
 usertools/dpdk-telemetry-watcher.py   | 27 ++++++++++++++++++++++++++-
 2 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/doc/guides/tools/telemetrywatcher.rst b/doc/guides/tools/telemetrywatcher.rst
index 5a9c60946b..b4ca1fcfc0 100644
--- a/doc/guides/tools/telemetrywatcher.rst
+++ b/doc/guides/tools/telemetrywatcher.rst
@@ -55,6 +55,15 @@ Options
    This shows the change in statistics since the last iteration,
    which is useful for monitoring per-second rates.
 
+.. option:: -T, --total
+
+   Display a total column at the end of each row that sums all monitored statistics.
+
+.. option:: -1, --single-line
+
+   Display output on a single line, replacing the previous output.
+   This is useful for reducing scrolling and keeping the display compact.
+
 .. option:: stat
 
    Statistics to monitor in format ``command.field``.
@@ -106,6 +115,24 @@ List all running DPDK applications::
    dpdk-telemetry-watcher.py -l
 
 
+Output Format
+-------------
+
+The tool displays statistics in a tabular format with:
+
+* **Time column** - Current timestamp (HH:MM:SS)
+* **Statistics columns** - One column per specified statistic
+* **Total column** - Optional sum of all statistics (when ``-T`` is used)
+
+Displayed values use locale-specific number formatting (e.g. comma as thousands separator).
+
+When ``--delta`` mode is enabled, the tool displays the change in each statistic
+since the last iteration, which typically represents the rate per second.
+
+When ``--single-line`` mode is enabled, each new output line replaces the previous one,
+similar to tools like ``top``.
+
+
 Dependencies
 ------------
 
diff --git a/usertools/dpdk-telemetry-watcher.py b/usertools/dpdk-telemetry-watcher.py
index 5f4aa05431..e4cd292515 100755
--- a/usertools/dpdk-telemetry-watcher.py
+++ b/usertools/dpdk-telemetry-watcher.py
@@ -210,10 +210,13 @@ def monitor_stats(process, args):
     header = "Time".ljust(10)
     for spec, _, _ in parsed_specs:
         header += spec.rjust(25)
+    if args.total:
+        header += "Total".rjust(25)
     print(header)
 
     # Monitor loop - once per second
     count = 0
+    line_ending = "\r" if args.single_line else "\n"
     try:
         while args.timeout is None or count < args.timeout:
             time.sleep(1)
@@ -223,6 +226,7 @@ def monitor_stats(process, args):
             row = timestamp.ljust(10)
 
             current_values = []
+            total = 0
             for i, (spec, command, field) in enumerate(parsed_specs):
                 data = query_telemetry(process, command)
                 current_value = data[field]
@@ -233,11 +237,17 @@ def monitor_stats(process, args):
                 else:
                     display_value = current_value
 
+                total += display_value
                 row += str(display_value).rjust(25)
 
-            print(row)
+            if args.total:
+                row += str(total).rjust(25)
+
+            print(row, end=line_ending, flush=True)
             prev_values = current_values
     except KeyboardInterrupt:
+        if args.single_line:
+            print()  # Add newline before exit message
         print("\nMonitoring stopped")
 
 
@@ -282,6 +292,21 @@ def main():
         default=False,
         help="Display delta values instead of absolute values",
     )
+    parser.add_argument(
+        "-T",
+        "--total",
+        action="store_true",
+        default=False,
+        help="Display a total column at the end of each row",
+    )
+    parser.add_argument(
+        "-1",
+        "--single-line",
+        action="store_true",
+        default=False,
+        dest="single_line",
+        help="Display output on a single line, replacing the previous output",
+    )
     parser.add_argument(
         "stats",
         nargs="*",
-- 
2.51.0