bitcoin-exporter: add counter for lists

resources/charts/bitcoincore/templates/servicemonitor.yaml

@@ -9,6 +9,7 @@ metadata:
 spec:
   endpoints:
     - port: prometheus-metrics
+      interval: {{ .Values.metricsScrapeInterval | default "15s" }}
   selector:
     matchLabels:
       app: {{ include "bitcoincore.fullname" . }}

resources/images/exporter/bitcoin-exporter.py

@@ -45,6 +45,13 @@ def make_metric_function(cmd):
         return None
 
 
+def make_counting_function(cmd, key, value):
+    try:
+        return lambda: sum(1 for x in eval(f"rpc.{cmd}") if x.get(key) == value)
+    except Exception:
+        return None
+
+
 # Parse RPC queries into metrics
 commands = METRICS.split(" ")
 for labeled_cmd in commands:
@@ -53,7 +60,12 @@ def make_metric_function(cmd):
     label, cmd = labeled_cmd.strip().split("=")
     # label, description i.e. ("bitcoin_conn_in", "Number of connections in")
     metric = Gauge(label, cmd)
-    metric.set_function(make_metric_function(cmd))
+    if "COUNT:" in cmd:
+        _, args = cmd.split(":")
+        cmd, key, value = args.split(",")
+        metric.set_function(make_counting_function(cmd, key, value))
+    else:
+        metric.set_function(make_metric_function(cmd))
     print(f"Metric created: {labeled_cmd}")
 
 # Start the server

test/data/logging/network.yaml

@@ -7,9 +7,9 @@ nodes:
     addnode:
       - tank-0002
     metricsExport: true
-    metrics: txrate=getchaintxstats(10)["txrate"]
+    metrics: txrate=getchaintxstats(10)["txrate"] ipv4peers=COUNT:getpeerinfo(),network,ipv4
   - name: tank-0002
-    addnode:
+    addnode:  
       - tank-0000
     ln:
       lnd: true