From 76c61e85b3a1464173acb70849957a9decc3f9c8 Mon Sep 17 00:00:00 2001
From: Mark Hansen <markhansen@google.com>
Date: Sat, 27 Jun 2020 21:21:11 +1000
Subject: [PATCH] Add tasmota_info prometheus psuedo-metric.

Exports version, image type, and build timestamp.

It's common to export something like this to show version numbers across the fleet.

For example, the golang exporter exposes version:
```
go_info{version="go1.14.4"} 1
```

And prometheus exposes:
```
prometheus_build_info{branch="HEAD",goversion="go1.14.4",revision="eba3fdcbf0d378b66600281903e3aab515732b39",version="2.19.1"} 1
```
---
 tasmota/xsns_75_prometheus.ino | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tasmota/xsns_75_prometheus.ino b/tasmota/xsns_75_prometheus.ino
index 5f50f8a2d..542755f80 100644
--- a/tasmota/xsns_75_prometheus.ino
+++ b/tasmota/xsns_75_prometheus.ino
@@ -35,6 +35,9 @@ void HandleMetrics(void)
 
   char parameter[FLOATSZ];
 
+  // Pseudo-metric providing metadata about the running firmware version.
+  WSContentSend_P(PSTR("# TYPE tasmota_info gauge\ntasmota_info{version=\"%s\",image=\"%s\",build_timestamp=\"%s\"} 1\n"),
+                  my_version, my_image, GetBuildDateAndTime().c_str());
   WSContentSend_P(PSTR("# TYPE tasmota_uptime_seconds gauge\ntasmota_uptime_seconds %d\n"), uptime);
   WSContentSend_P(PSTR("# TYPE tasmota_boot_count counter\ntasmota_boot_count %d\n"), Settings.bootcount);