Add diskstats collector for OpenBSD (#1250)

* Add diskstats collector for OpenBSD

Tested on i386 and amd64, OpenBSD 6.4 and -current.

* Refactor diskstats collectors

This moves common descriptors from Linux, Darwin, OpenBSD
diskstats collectors into diskstats_common.go

Signed-off-by: Ralf Horstmann <ralf+github@ackstorm.de>

1 files changed, 73 insertions, 0 deletions

diff --git a/collector/diskstats_common.go b/collector/diskstats_common.go
new file mode 100644
index 0000000..7efb399
--- /dev/null
+++ b/collector/diskstats_common.go
@@ -0,0 +1,73 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !nodiskstats
+// +build openbsd linux darwin
+
+package collector
+
+import (
+        "github.com/prometheus/client_golang/prometheus"
+)
+
+const (
+        diskSubsystem = "disk"
+)
+
+var (
+        diskLabelNames = []string{"device"}
+
+        readsCompletedDesc = prometheus.NewDesc(
+                prometheus.BuildFQName(namespace, diskSubsystem, "reads_completed_total"),
+                "The total number of reads completed successfully.",
+                diskLabelNames, nil,
+        )
+
+        readBytesDesc = prometheus.NewDesc(
+                prometheus.BuildFQName(namespace, diskSubsystem, "read_bytes_total"),
+                "The total number of bytes read successfully.",
+                diskLabelNames, nil,
+        )
+
+        writesCompletedDesc = prometheus.NewDesc(
+                prometheus.BuildFQName(namespace, diskSubsystem, "writes_completed_total"),
+                "The total number of writes completed successfully.",
+                diskLabelNames, nil,
+        )
+
+        writtenBytesDesc = prometheus.NewDesc(
+                prometheus.BuildFQName(namespace, diskSubsystem, "written_bytes_total"),
+                "The total number of bytes written successfully.",
+                diskLabelNames, nil,
+        )
+
+        ioTimeSecondsDesc = prometheus.NewDesc(
+                prometheus.BuildFQName(namespace, diskSubsystem, "io_time_seconds_total"),
+                "Total seconds spent doing I/Os.",
+                diskLabelNames, nil,
+        )
+
+        readTimeSecondsDesc = prometheus.NewDesc(
+                prometheus.BuildFQName(namespace, diskSubsystem, "read_time_seconds_total"),
+                "The total number of seconds spent by all reads.",
+                diskLabelNames,
+                nil,
+        )
+
+        writeTimeSecondsDesc = prometheus.NewDesc(
+                prometheus.BuildFQName(namespace, diskSubsystem, "write_time_seconds_total"),
+                "This is the total number of seconds spent by all writes.",
+                diskLabelNames,
+                nil,
+        )
+)