Revert "CP-47869: Removed rrdd-example.py ocaml/xcp-rrdd/scripts/rrdd/"

Signed-off-by: Ashwinh <[email protected]>

This reverts commit a1b06ec.

ocaml/xcp-rrdd/scripts/rrdd/rrdd-example.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+
+import rrdd, os
+
+if __name__ == "__main__":
+  # Create a proxy for communicating with xcp-rrdd.
+  api = rrdd.API(plugin_id="host_mem")
+  while True:
+    # Wait until 0.5 seconds before xcp-rrdd is going to read the output file.
+    api.wait_until_next_reading(neg_shift=.5)
+    # Collect measurements.
+    cmd = "free -k | grep Mem | awk '{print $2, $3, $4}'"
+    vs = os.popen(cmd).read().strip().split()
+    # Tell the proxy which datasources should be exposed in this iteration.
+    api.set_datasource("used_mem", vs[1], min_val=0, max_val=vs[0], units="KB")
+    api.set_datasource("free_mem", vs[2], min_val=0, max_val=vs[0], units="KB")
+    # Write all required information into a file about to be read by xcp-rrdd.
+    api.update()