First cut

Dockerfile

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+FROM ubi9
+ADD prom-target.py /
+ENTRYPOINT ["/prom-target.py"]

README.md

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+# prom-target
+
+Simple script to generate fake prometheus metrics
+
+## Usage
+
+```
+$ ./prom-target.py &
+[1] 3475808
+Listening on port 8000 to serve 10000 total metrics
+
+$ curl http://localhost:8000
+127.0.0.1 - - [07/Dec/2022 17:47:11] "GET / HTTP/1.1" 200 -
+#Mock Prometheus metrics
+mock_metric_0{labelA="0",labelB="0"} 1
+mock_metric_0{labelA="1",labelB="0"} 2
+[...]
+
+$ kill %%
+[1]+  Terminated              ./prom-target.py -m 1000 -l 10
+```
+
+## Container
+
+```
+$ podman build -t prom-target .
+[...]
+
+$ podman run --name target1 -d -p 8000:8000 prom-target -m 100 -l 5
+6bfe29b1fb6e720d0a72cf64a931101d65286825f8e2eceef2419b2f1646135c
+
+$ curl localhost:8000                                                               
+#Mock Prometheus metrics                                                                                                  
+mock_metric_0{labelA="0",labelB="0"} 1                                  
+mock_metric_0{labelA="1",labelB="0"} 2          
+[...]
+
+$ podman rm -f target1
+6bfe29b1fb6e720d0a72cf64a931101d65286825f8e2eceef2419b2f1646135c
+```

prom-target.py

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+#!/usr/bin/env python3
+import argparse
+from http.server import HTTPServer, BaseHTTPRequestHandler
+
+
+class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):
+
+    def do_GET(self):
+        self.send_response(200)
+        self.end_headers()
+        self.wfile.write(b"#Mock Prometheus metrics\n")
+        a_range = int(args.metrics/2)
+        i = 0
+        for m in range(0, args.metrics):
+            for la in range(0, args.labels):
+                i = i+1
+                self.wfile.write(f"mock_metric_{m}{{labelA=\"{la}\",labelB=\"0\"}} {i}\n".encode())
+
+parser = argparse.ArgumentParser(
+                    prog='prom-target',
+                    description='Serves a prometheus endpoint with a specified number of metrics and label cardinality')
+parser.add_argument('-p', '--port', type=int, default=8000)
+parser.add_argument('-m', '--metrics', type=int, default=1000)
+parser.add_argument('-l', '--labels', type=int, default=10)
+args = parser.parse_args()
+
+print(f'Listening on port {args.port} to serve {args.metrics * args.labels} total metrics')
+
+httpd = HTTPServer(('0.0.0.0', args.port), SimpleHTTPRequestHandler)
+httpd.serve_forever()