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+---
+title: 'CatBus: logging'
+subtitle: easy low-configuration logging
+date: 2020-02-20
+---
+{% extends 'templates/base.html' %}
+{% block body %}
+	<nav>
+		<a href='/catbus'>&gt; catbus home</a>
+	</nav>
+	<header>
+		<h1>{{ title }}</h1>
+		<p>{{ subtitle }}</p>
+	</header>
+	<article>
+{% markdown %}
+Using the MQTT bus as a unified system with a unified semantic naming scheme means that I can also implement logging without the need for much configuration.
+
+Following the above scheme, we can automatically scrape all devices named `*-sensor` into Prometheus metrics:
+
+```
+$control{zone=$zone,device=$device} = $value
+```
+
+For example,
+
+```
+temperature_celsius{zone=bedroom,device=window-sensor} = 17
+```
+
+Likewise, we can export enums as:
+
+```
+home/zone/device/control_enum:
+    foo
+
+home/zone/device/control_enum/values:
+    bar
+    foo
+
+control{zone=,device=,value=bar} = 0
+control{zone=,device=,value=foo} = 1
+```
+{% endmarkdown %}
+	</article>
+{% endblock %}