Corrects the telemetry config comments

config/telemetry.go

@@ -163,14 +163,14 @@ type TelemetryConfig struct {
 	// by prefix. Use the 'prefix_filter' option and prefix rules with '+' to be
 	// included.
 	//
-	// hcl: telemetry { prefix_filter = []string{"+<expr>", "+<expr>", ...} }
+	// hcl: telemetry { allowed_prefixes = ["<expr>", "<expr>", ...] }
 	AllowedPrefixes []string `json:"allowed_prefixes,omitempty" mapstructure:"allowed_prefixes"`
 
 	// BlockedPrefixes is a list of filter rules to apply for blocking metrics
 	// by prefix. Use the 'prefix_filter' option and prefix rules with '-' to be
 	// excluded.
 	//
-	// hcl: telemetry { prefix_filter = []string{"-<expr>", "-<expr>", ...} }
+	// hcl: telemetry { blocked_prefixes = ["<expr>", "<expr>", ...] }
 	BlockedPrefixes []string `json:"blocked_prefixes,omitempty" mapstructure:"blocked_prefixes"`
 
 	// MetricsPrefix is the prefix used to write stats values to.

config/telemetry_test.go

@@ -11,13 +11,20 @@ func TestPromConfigParsing(t *testing.T) {
 	configStr := "telemetry {" +
 		"prometheus_port = 9110" +
 		"prometheus_retention_time = \"120s\"" +
+		"allowed_prefixes = [\"keep\"]" +
+		"blocked_prefixes = [\"dont_keep\"]" +
+		"metrics_prefix = \"consul_template\"" +
 		"}"
 
 	config, err := Parse(configStr)
 	require.NoError(t, err)
 
 	require.Equal(t, 9110, config.Telemetry.PrometheusPort)
 	require.Equal(t, 120*time.Second, config.Telemetry.PrometheusRetentionTime)
+	require.Equal(t, "consul_template", config.Telemetry.MetricsPrefix)
+	require.Equal(t, "consul_template", config.Telemetry.MetricsPrefix)
+	require.ElementsMatch(t, []string{"keep"}, config.Telemetry.AllowedPrefixes)
+	require.ElementsMatch(t, []string{"dont_keep"}, config.Telemetry.BlockedPrefixes)
 
 	config.Finalize()
 	require.Equal(t, 9110, config.Telemetry.PrometheusPort)