Update metrics before starting the exporter

zuul-capacity.py

@@ -5,7 +5,7 @@
 from dataclasses import dataclass
 from prometheus_client import start_http_server, Gauge
 
-log = logging.getLogger(__name__)
+log = logging.getLogger("zuul-capacity")
 
 @dataclass
 class Resource:
@@ -29,7 +29,7 @@ def get_resources(cloud):
 @dataclass
 class Provider:
     max_server: int
-    cloud: any
+    cloud: openstack.Cloud
 
     def from_nodepool(provider):
         return Provider(
@@ -46,6 +46,17 @@ def get_providers(nodepool_yaml):
             providers[provider["name"]] = Provider.from_nodepool(provider)
     return providers
 
+def update_providers_metric(metrics, providers):
+    for (name, provider) in providers.items():
+        resources = get_resources(provider.cloud)
+        metrics["instances"].labels(cloud=name).set(len(resources))
+        cpu, mem = 0, 0
+        for resource in resources:
+            cpu += resource.cpu
+            mem += resource.mem
+        metrics["cpu"].labels(cloud=name).set(cpu)
+        metrics["mem"].labels(cloud=name).set(mem)
+
 def usage():
     parser = argparse.ArgumentParser()
     parser.add_argument("--nodepool", metavar="FILE", required=True)
@@ -63,20 +74,14 @@ def main():
 
     providers = get_providers(args.nodepool)
 
+    update_providers_metric(metrics, providers)
+
     # Initialize connection
     log.info("Starting exporter at :8080 for %d provider", len(providers))
     start_http_server(8080)
 
     while True:
-        for (name, provider) in providers.items():
-            resources = get_resources(provider.cloud)
-            metrics["instances"].labels(cloud=name).set(len(resources))
-            cpu, mem = 0, 0
-            for resource in resources:
-                cpu += resource.cpu
-                mem += resource.mem
-            metrics["cpu"].labels(cloud=name).set(cpu)
-            metrics["mem"].labels(cloud=name).set(mem)
+        update_providers_metric(metrics, providers)
         time.sleep(300)