From eaa3cd83adf860732b955a77b8f5fca7e30c65c2 Mon Sep 17 00:00:00 2001
From: "Alexander A. Klimov" <alexander.klimov@icinga.com>
Date: Mon, 28 Nov 2022 12:27:01 +0100
Subject: [PATCH] Influx DB: don't unneccessarily truncate timestamps to whole
 seconds

Instead send timestamps with the highest possible precision (ns).
Useful for check intervals <1s.
---
 lib/perfdata/influxdbcommonwriter.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/perfdata/influxdbcommonwriter.cpp b/lib/perfdata/influxdbcommonwriter.cpp
index a42d9e182..fd588a178 100644
--- a/lib/perfdata/influxdbcommonwriter.cpp
+++ b/lib/perfdata/influxdbcommonwriter.cpp
@@ -37,6 +37,7 @@
 #include <boost/math/special_functions/fpclassify.hpp>
 #include <boost/regex.hpp>
 #include <boost/scoped_array.hpp>
+#include <iomanip>
 #include <memory>
 #include <string>
 #include <utility>
@@ -398,7 +399,7 @@ void InfluxdbCommonWriter::SendMetric(const Checkable::Ptr& checkable, const Dic
 		}
 	}
 
-	msgbuf << " " <<  static_cast<unsigned long>(ts);
+	msgbuf << " " << std::fixed << std::setprecision(0) << ts * 1.0e9;
 
 	Log(LogDebug, GetReflectionType()->GetName())
 		<< "Checkable '" << checkable->GetName() << "' adds to metric list:'" << msgbuf.str() << "'.";
@@ -553,7 +554,7 @@ Url::Ptr InfluxdbCommonWriter::AssembleBaseUrl()
 	url->SetScheme(GetSslEnable() ? "https" : "http");
 	url->SetHost(GetHost());
 	url->SetPort(GetPort());
-	url->AddQueryElement("precision", "s");
+	url->AddQueryElement("precision", "ns");
 
 	return url;
 }