[feature] Initial Prometheus metrics implementation (#2334)

* feat: Initial OTEL metrics

* docs: add metrics documentation

* fix: metrics endpoint conditional check

* feat: metrics endpoint basic auth

* fix: make metrics-auth-enabled default false

* fix: go fmt helpers.gen.go

* fix: add metric-related env vars to envparsing.sh

* fix: metrics docs

* fix: metrics related stuff in envparsing.sh

* fix: metrics docs

* chore: metrics docs wording

* fix: metrics stuff in envparsing?

* bump otel versions

---------

Co-authored-by: Tsuribori <user@acertaindebian>
Co-authored-by: Tsuribori <none@example.org>
Co-authored-by: tsmethurst <tobi.smethurst@protonmail.com>

1 files changed, 143 insertions, 0 deletions

diff --git a/vendor/github.com/prometheus/procfs/net_route.go b/vendor/github.com/prometheus/procfs/net_route.go
new file mode 100644
index 000000000..deb7029fe
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/net_route.go
@@ -0,0 +1,143 @@
+// Copyright 2023 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.
+
+package procfs
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+
+	"github.com/prometheus/procfs/internal/util"
+)
+
+const (
+	blackholeRepresentation string = "*"
+	blackholeIfaceName      string = "blackhole"
+	routeLineColumns        int    = 11
+)
+
+// A NetRouteLine represents one line from net/route.
+type NetRouteLine struct {
+	Iface       string
+	Destination uint32
+	Gateway     uint32
+	Flags       uint32
+	RefCnt      uint32
+	Use         uint32
+	Metric      uint32
+	Mask        uint32
+	MTU         uint32
+	Window      uint32
+	IRTT        uint32
+}
+
+func (fs FS) NetRoute() ([]NetRouteLine, error) {
+	return readNetRoute(fs.proc.Path("net", "route"))
+}
+
+func readNetRoute(path string) ([]NetRouteLine, error) {
+	b, err := util.ReadFileNoStat(path)
+	if err != nil {
+		return nil, err
+	}
+
+	routelines, err := parseNetRoute(bytes.NewReader(b))
+	if err != nil {
+		return nil, fmt.Errorf("failed to read net route from %s: %w", path, err)
+	}
+	return routelines, nil
+}
+
+func parseNetRoute(r io.Reader) ([]NetRouteLine, error) {
+	var routelines []NetRouteLine
+
+	scanner := bufio.NewScanner(r)
+	scanner.Scan()
+	for scanner.Scan() {
+		fields := strings.Fields(scanner.Text())
+		routeline, err := parseNetRouteLine(fields)
+		if err != nil {
+			return nil, err
+		}
+		routelines = append(routelines, *routeline)
+	}
+	return routelines, nil
+}
+
+func parseNetRouteLine(fields []string) (*NetRouteLine, error) {
+	if len(fields) != routeLineColumns {
+		return nil, fmt.Errorf("invalid routeline, num of digits: %d", len(fields))
+	}
+	iface := fields[0]
+	if iface == blackholeRepresentation {
+		iface = blackholeIfaceName
+	}
+	destination, err := strconv.ParseUint(fields[1], 16, 32)
+	if err != nil {
+		return nil, err
+	}
+	gateway, err := strconv.ParseUint(fields[2], 16, 32)
+	if err != nil {
+		return nil, err
+	}
+	flags, err := strconv.ParseUint(fields[3], 10, 32)
+	if err != nil {
+		return nil, err
+	}
+	refcnt, err := strconv.ParseUint(fields[4], 10, 32)
+	if err != nil {
+		return nil, err
+	}
+	use, err := strconv.ParseUint(fields[5], 10, 32)
+	if err != nil {
+		return nil, err
+	}
+	metric, err := strconv.ParseUint(fields[6], 10, 32)
+	if err != nil {
+		return nil, err
+	}
+	mask, err := strconv.ParseUint(fields[7], 16, 32)
+	if err != nil {
+		return nil, err
+	}
+	mtu, err := strconv.ParseUint(fields[8], 10, 32)
+	if err != nil {
+		return nil, err
+	}
+	window, err := strconv.ParseUint(fields[9], 10, 32)
+	if err != nil {
+		return nil, err
+	}
+	irtt, err := strconv.ParseUint(fields[10], 10, 32)
+	if err != nil {
+		return nil, err
+	}
+	routeline := &NetRouteLine{
+		Iface:       iface,
+		Destination: uint32(destination),
+		Gateway:     uint32(gateway),
+		Flags:       uint32(flags),
+		RefCnt:      uint32(refcnt),
+		Use:         uint32(use),
+		Metric:      uint32(metric),
+		Mask:        uint32(mask),
+		MTU:         uint32(mtu),
+		Window:      uint32(window),
+		IRTT:        uint32(irtt),
+	}
+	return routeline, nil
+}