feat: add disk usage as a metric for ethereum-metrics-exporter

src/ethereum_metrics_exporter/ethereum_metrics_exporter_launcher.star

@@ -6,6 +6,9 @@ ethereum_metrics_exporter_context = import_module(
 HTTP_PORT_ID = "http"
 METRICS_PORT_NUMBER = 9090
 
+path_to_el_db = "/data/execution-db"
+path_to_cl_db = "/data/consensus-db"
+
 DEFAULT_ETHEREUM_METRICS_EXPORTER_IMAGE = "ethpandaops/ethereum-metrics-exporter:latest"
 
 # The min/max CPU/memory that ethereum-metrics-exporter can use
@@ -25,14 +28,41 @@ def launch(
     port_publisher,
     global_other_index,
     docker_cache_params,
+    persistent,
 ):
     public_ports = shared_utils.get_other_public_port(
         port_publisher,
         HTTP_PORT_ID,
         global_other_index,
         0,
     )
+    files = {}
+    cmd = [
+        "--metrics-port",
+        str(METRICS_PORT_NUMBER),
+        "--consensus-url",
+        "{0}".format(
+            cl_context.beacon_http_url,
+        ),
+        "--execution-url",
+        "http://{}:{}".format(
+            el_context.ip_addr,
+            el_context.rpc_port_num,
+        ),
+    ]
+
+    if persistent:
+        cmd.append("--monitored-directories")
+        cmd.append(path_to_cl_db)
+        cmd.append("--monitored-directories")
+        cmd.append(path_to_el_db)
 
+        files[path_to_el_db] = Directory(
+            persistent_key="data-{0}".format(el_context.service_name),
+        )
+        files[path_to_cl_db] = Directory(
+            persistent_key="data-{0}".format(cl_context.beacon_service_name),
+        )
     exporter_service = plan.add_service(
         ethereum_metrics_exporter_service_name,
         ServiceConfig(
@@ -48,19 +78,8 @@ def launch(
                 )
             },
             public_ports=public_ports,
-            cmd=[
-                "--metrics-port",
-                str(METRICS_PORT_NUMBER),
-                "--consensus-url",
-                "{0}".format(
-                    cl_context.beacon_http_url,
-                ),
-                "--execution-url",
-                "http://{}:{}".format(
-                    el_context.ip_addr,
-                    el_context.rpc_port_num,
-                ),
-            ],
+            cmd=cmd,
+            files=files,
             min_cpu=MIN_CPU,
             max_cpu=MAX_CPU,
             min_memory=MIN_MEMORY,

src/participant_network.star

@@ -230,6 +230,7 @@ def launch_participant_network(
                 args_with_right_defaults.port_publisher,
                 global_other_index,
                 args_with_right_defaults.docker_cache_params,
+                persistent,
             )
             global_other_index += 1
             plan.print(