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metrics: add support for enabling metrics from env vars (#28118)

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This commit is contained in:
Daniel Liu 2024-12-13 14:00:13 +08:00
parent cc4ea7a685
commit 2f36a79f67
1 changed files with 24 additions and 0 deletions
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24
metrics/metrics.go
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@ -9,7 +9,9 @@ import (
"os"
"runtime/metrics"
"runtime/pprof"
"strconv"
"strings"
"syscall"
"time"
"github.com/XinFinOrg/XDPoSChain/log"
@ -30,13 +32,35 @@ var EnabledExpensive = false
// enablerFlags is the CLI flag names to use to enable metrics collections.
var enablerFlags = []string{"metrics"}
// enablerEnvVars is the env var names to use to enable metrics collections.
var enablerEnvVars = []string{"XDC_METRICS"}
// expensiveEnablerFlags is the CLI flag names to use to enable metrics collections.
var expensiveEnablerFlags = []string{"metrics-expensive"}
// expensiveEnablerEnvVars is the env var names to use to enable metrics collections.
var expensiveEnablerEnvVars = []string{"XDC_METRICS_EXPENSIVE"}
// Init enables or disables the metrics system. Since we need this to run before
// any other code gets to create meters and timers, we'll actually do an ugly hack
// and peek into the command line args for the metrics flag.
func init() {
for _, enabler := range enablerEnvVars {
if val, found := syscall.Getenv(enabler); found && !Enabled {
if enable, _ := strconv.ParseBool(val); enable { // ignore error, flag parser will choke on it later
log.Info("Enabling metrics collection")
Enabled = true
}
}
}
for _, enabler := range expensiveEnablerEnvVars {
if val, found := syscall.Getenv(enabler); found && !EnabledExpensive {
if enable, _ := strconv.ParseBool(val); enable { // ignore error, flag parser will choke on it later
log.Info("Enabling expensive metrics collection")
EnabledExpensive = true
}
}
}
for _, arg := range os.Args {
flag := strings.TrimLeft(arg, "-")