Drop mention of envconfig

Author: codebien

pkg/remotewrite/config.go

@@ -25,32 +25,32 @@ var defaultTrendStats = []string{"p(99)"}
 
 type Config struct {
 	// ServerURL contains the absolute ServerURL for the Write endpoint where to flush the time series.
-	ServerURL null.String `json:"url" envconfig:"K6_PROMETHEUS_RW_SERVER_URL"`
+	ServerURL null.String `json:"url"`
 
 	// Headers contains additional headers that should be included in the HTTP requests.
-	Headers map[string]string `json:"headers" envconfig:"K6_PROMETHEUS_RW_HEADERS"`
+	Headers map[string]string `json:"headers"`
 
 	// InsecureSkipTLSVerify skips TLS client side checks.
-	InsecureSkipTLSVerify null.Bool `json:"insecureSkipTLSVerify" envconfig:"K6_PROMETHEUS_RW_INSECURE_SKIP_TLS_VERIFY"`
+	InsecureSkipTLSVerify null.Bool `json:"insecureSkipTLSVerify"`
 
 	// Username is the User for Basic Auth.
-	Username null.String `json:"username" envconfig:"K6_PROMETHEUS_RW_USERNAME"`
+	Username null.String `json:"username"`
 
 	// Password is the Password for the Basic Auth.
-	Password null.String `json:"password" envconfig:"K6_PROMETHEUS_RW_PASSWORD"`
+	Password null.String `json:"password"`
 
 	// PushInterval defines the time between flushes. The Output will wait the set time
 	// before push a new set of time series to the endpoint.
-	PushInterval types.NullDuration `json:"pushInterval" envconfig:"K6_PROMETHEUS_RW_PUSH_INTERVAL"`
+	PushInterval types.NullDuration `json:"pushInterval"`
 
 	// TrendAsNativeHistogram defines if the mapping for metrics defined as Trend type
 	// should map to a Prometheus' Native Histogram.
-	TrendAsNativeHistogram null.Bool `json:"trendAsNativeHistogram" envconfig:"K6_PROMETHEUS_RW_TREND_AS_NATIVE_HISTOGRAM"`
+	TrendAsNativeHistogram null.Bool `json:"trendAsNativeHistogram"`
 
 	// TrendStats defines the stats to flush for Trend metrics.
 	//
 	// TODO: should we support K6_SUMMARY_TREND_STATS?
-	TrendStats []string `json:"trendStats" envconfig:"K6_PROMETHEUS_RW_TREND_STATS"`
+	TrendStats []string `json:"trendStats"`
 }
 
 // NewConfig creates an Output's configuration.
@@ -193,7 +193,6 @@ func parseEnvs(env map[string]string) (Config, error) {
 		return result
 	}
 
-	// envconfig is not processing some undefined vars (at least duration) so apply them manually
 	if pushInterval, pushIntervalDefined := env["K6_PROMETHEUS_RW_PUSH_INTERVAL"]; pushIntervalDefined {
 		if err := c.PushInterval.UnmarshalText([]byte(pushInterval)); err != nil {
 			return c, err