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metrics: DRY metric definitions

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Having to declare a package-scope variable and separately initialize it
is repetitive and error-prone. Refactor so that each metric is defined
and initialized in the same statement.

Signed-off-by: Cory Snider <csnider@mirantis.com>
This commit is contained in:
Cory Snider 2022-04-12 16:22:37 -04:00
parent c110770e08
commit 1d6e0fb103
1 changed files with 28 additions and 35 deletions
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63
daemon/metrics.go
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@ -15,34 +15,13 @@ import (
const metricsPluginType = "MetricsCollector"
var (
containerActions metrics.LabeledTimer
networkActions metrics.LabeledTimer
hostInfoFunctions metrics.LabeledTimer
engineInfo metrics.LabeledGauge
engineCpus metrics.Gauge
engineMemory metrics.Gauge
healthChecksCounter metrics.Counter
healthChecksFailedCounter metrics.Counter
metricsNS = metrics.NewNamespace("engine", "daemon", nil)
stateCtr *stateCounter
)
containerActions = metricsNS.NewLabeledTimer("container_actions", "The number of seconds it takes to process each container action", "action")
networkActions = metricsNS.NewLabeledTimer("network_actions", "The number of seconds it takes to process each network action", "action")
hostInfoFunctions = metricsNS.NewLabeledTimer("host_info_functions", "The number of seconds it takes to call functions gathering info about the host", "function")
func init() {
ns := metrics.NewNamespace("engine", "daemon", nil)
containerActions = ns.NewLabeledTimer("container_actions", "The number of seconds it takes to process each container action", "action")
for _, a := range []string{
"start",
"changes",
"commit",
"create",
"delete",
} {
containerActions.WithValues(a).Update(0)
}
hostInfoFunctions = ns.NewLabeledTimer("host_info_functions", "The number of seconds it takes to call functions gathering info about the host", "function")
networkActions = ns.NewLabeledTimer("network_actions", "The number of seconds it takes to process each network action", "action")
engineInfo = ns.NewLabeledGauge("engine", "The information related to the engine and the OS it is running on", metrics.Unit("info"),
engineInfo = metricsNS.NewLabeledGauge("engine", "The information related to the engine and the OS it is running on", metrics.Unit("info"),
"version",
"commit",
"architecture",
@ -53,15 +32,27 @@ func init() {
"os_version",
"daemon_id", // ID is a randomly generated unique identifier (e.g. UUID4)
)
engineCpus = ns.NewGauge("engine_cpus", "The number of cpus that the host system of the engine has", metrics.Unit("cpus"))
engineMemory = ns.NewGauge("engine_memory", "The number of bytes of memory that the host system of the engine has", metrics.Bytes)
healthChecksCounter = ns.NewCounter("health_checks", "The total number of health checks")
healthChecksFailedCounter = ns.NewCounter("health_checks_failed", "The total number of failed health checks")
engineCpus = metricsNS.NewGauge("engine_cpus", "The number of cpus that the host system of the engine has", metrics.Unit("cpus"))
engineMemory = metricsNS.NewGauge("engine_memory", "The number of bytes of memory that the host system of the engine has", metrics.Bytes)
stateCtr = newStateCounter(ns.NewDesc("container_states", "The count of containers in various states", metrics.Unit("containers"), "state"))
ns.Add(stateCtr)
healthChecksCounter = metricsNS.NewCounter("health_checks", "The total number of health checks")
healthChecksFailedCounter = metricsNS.NewCounter("health_checks_failed", "The total number of failed health checks")
metrics.Register(ns)
stateCtr = newStateCounter(metricsNS, metricsNS.NewDesc("container_states", "The count of containers in various states", metrics.Unit("containers"), "state"))
)
func init() {
for _, a := range []string{
"start",
"changes",
"commit",
"create",
"delete",
} {
containerActions.WithValues(a).Update(0)
}
metrics.Register(metricsNS)
}
type stateCounter struct {
@ -70,11 +61,13 @@ type stateCounter struct {
desc *prometheus.Desc
}
func newStateCounter(desc *prometheus.Desc) *stateCounter {
return &stateCounter{
func newStateCounter(ns *metrics.Namespace, desc *prometheus.Desc) *stateCounter {
c := &stateCounter{
states: make(map[string]string),
desc: desc,
}
ns.Add(c)
return c
}
func (ctr *stateCounter) get() (running int, paused int, stopped int) {