From: Michael Tremer <michael.tremer@ipfire.org>
Date: Fri, 10 Jul 2026 15:32:06 +0000 (+0000)
Subject: graphs: knot-resolver: Add a latency graph
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fef4caab917b7ed60ba9612752bfe7fdc248c966;p=telemetry.git

graphs: knot-resolver: Add a latency graph

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/src/daemon/graphs.c b/src/daemon/graphs.c
index edc6ed2..8ec2556 100644
--- a/src/daemon/graphs.c
+++ b/src/daemon/graphs.c
@@ -98,6 +98,7 @@ static const td_graph_impl* graph_impls[] = {
 	&knot_resolver_cache_graph,
 	&knot_resolver_transports_graph,
 	&knot_resolver_responses_graph,
+	&knot_resolver_latency_graph,
 
 	// Unbound
 	&unbound_cache_performance_graph,
diff --git a/src/daemon/graphs/knot-resolver.c b/src/daemon/graphs/knot-resolver.c
index fa3554d..c691918 100644
--- a/src/daemon/graphs/knot-resolver.c
+++ b/src/daemon/graphs/knot-resolver.c
@@ -254,3 +254,98 @@ const td_graph_impl knot_resolver_responses_graph = {
 	.lower_limit = 0,
 	.upper_limit = LONG_MAX,
 };
+
+// Latency
+
+// We define the colours locally because no other software will have the same buckets
+#define COLOR_LATENCY_1MS		COLOR_CLEAN_GREEN
+#define COLOR_LATENCY_10MS		COLOR_FRESH_LIME
+#define COLOR_LATENCY_50MS		COLOR_YELLOW_GOLD
+#define COLOR_LATENCY_100MS		COLOR_CLEAN_AMBER
+#define COLOR_LATENCY_250MS		COLOR_WARM_ORANGE
+#define COLOR_LATENCY_500MS		COLOR_SOFT_RED
+#define COLOR_LATENCY_1000MS	COLOR_PRIMARY
+#define COLOR_LATENCY_1500MS	COLOR_PURPLE_MAGENTA
+#define COLOR_LATENCY_SLOW		COLOR_PINK_MAGENTA
+
+static int knot_resolver_latency_title(td_ctx* ctx, td_graph* graph,
+		const char* object, char* title, size_t length) {
+	return __td_string_set(title, length, _("Latency"));
+}
+
+static int knot_resolver_latency_render(td_ctx* ctx, td_graph* graph,
+		const td_graph_render_options* options, td_args* args, const char* object) {
+	int r;
+
+	// Load all sources
+	r = td_graph_load_source(graph, args, "knot-resolver", NULL);
+	if (r < 0)
+		return r;
+
+	// Header
+	PRINT_HEADER4(args, _("Current"), _("Average"), _("Minimum"), _("Maximum"));
+
+	PRINT_EMPTY_LINE(args);
+
+	// Draw the stacked backgrounds first
+	DRAW_AREA_BACKGROUND(args, "answer_1ms",    NULL, COLOR_LATENCY_1MS,    0);
+	DRAW_AREA_BACKGROUND(args, "answer_10ms",   NULL, COLOR_LATENCY_10MS,   STACKED);
+	DRAW_AREA_BACKGROUND(args, "answer_50ms",   NULL, COLOR_LATENCY_50MS,   STACKED);
+	DRAW_AREA_BACKGROUND(args, "answer_100ms",  NULL, COLOR_LATENCY_100MS,  STACKED);
+	DRAW_AREA_BACKGROUND(args, "answer_250ms",  NULL, COLOR_LATENCY_250MS,  STACKED);
+	DRAW_AREA_BACKGROUND(args, "answer_500ms",  NULL, COLOR_LATENCY_500MS,  STACKED);
+	DRAW_AREA_BACKGROUND(args, "answer_1000ms", NULL, COLOR_LATENCY_1000MS, STACKED);
+	DRAW_AREA_BACKGROUND(args, "answer_1500ms", NULL, COLOR_LATENCY_1500MS, STACKED);
+	DRAW_AREA_BACKGROUND(args, "answer_slow",   NULL, COLOR_LATENCY_SLOW,   STACKED);
+
+	// Draw the area outlines afterwards
+	DRAW_AREA_OUTLINE_WITH_LABEL(args, "answer_1ms", NULL,
+			COLOR_LATENCY_1MS, 0, _("0-1 ms"));
+	PRINT_CAMM(args, "answer_1ms", NULL, QPS, QPS_UNIT);
+
+	DRAW_AREA_OUTLINE_WITH_LABEL(args, "answer_10ms", NULL,
+			COLOR_LATENCY_10MS, STACKED, _("1-10 ms"));
+	PRINT_CAMM(args, "answer_10ms", NULL, QPS, QPS_UNIT);
+
+	DRAW_AREA_OUTLINE_WITH_LABEL(args, "answer_50ms", NULL,
+			COLOR_LATENCY_10MS, STACKED, _("10-50 ms"));
+	PRINT_CAMM(args, "answer_50ms", NULL, QPS, QPS_UNIT);
+
+	DRAW_AREA_OUTLINE_WITH_LABEL(args, "answer_100ms", NULL,
+			COLOR_LATENCY_100MS, STACKED, _("50-100 ms"));
+	PRINT_CAMM(args, "answer_100ms", NULL, QPS, QPS_UNIT);
+
+	DRAW_AREA_OUTLINE_WITH_LABEL(args, "answer_250ms", NULL,
+			COLOR_LATENCY_250MS, STACKED, _("100-250 ms"));
+	PRINT_CAMM(args, "answer_250ms", NULL, QPS, QPS_UNIT);
+
+	DRAW_AREA_OUTLINE_WITH_LABEL(args, "answer_500ms", NULL,
+			COLOR_LATENCY_500MS, STACKED, _("250-500 ms"));
+	PRINT_CAMM(args, "answer_500ms", NULL, QPS, QPS_UNIT);
+
+	DRAW_AREA_OUTLINE_WITH_LABEL(args, "answer_1000ms", NULL,
+			COLOR_LATENCY_1000MS, STACKED, _("500-1000 ms"));
+	PRINT_CAMM(args, "answer_1000ms", NULL, QPS, QPS_UNIT);
+
+	DRAW_AREA_OUTLINE_WITH_LABEL(args, "answer_1500ms", NULL,
+			COLOR_LATENCY_1500MS, STACKED, _("1000-1500 ms"));
+	PRINT_CAMM(args, "answer_1500ms", NULL, QPS, QPS_UNIT);
+
+	DRAW_AREA_OUTLINE_WITH_LABEL(args, "answer_slow", NULL,
+			COLOR_LATENCY_SLOW, STACKED, _("> 1500ms"));
+	PRINT_CAMM(args, "answer_slow", NULL, QPS, QPS_UNIT);
+
+	return 0;
+}
+
+const td_graph_impl knot_resolver_latency_graph = {
+	.name        = "KnotResolverLatency",
+	.can_render  = knot_resolver_can_render,
+	.render      = knot_resolver_latency_render,
+	.title       = knot_resolver_latency_title,
+	.vlabel      = td_graph_vlabel_qps,
+
+	// Limits
+	.lower_limit = 0,
+	.upper_limit = LONG_MAX,
+};
diff --git a/src/daemon/graphs/knot-resolver.h b/src/daemon/graphs/knot-resolver.h
index cd8dd09..2b9e4ca 100644
--- a/src/daemon/graphs/knot-resolver.h
+++ b/src/daemon/graphs/knot-resolver.h
@@ -27,5 +27,6 @@ extern const td_graph_impl knot_resolver_queries_graph;
 extern const td_graph_impl knot_resolver_cache_graph;
 extern const td_graph_impl knot_resolver_transports_graph;
 extern const td_graph_impl knot_resolver_responses_graph;
+extern const td_graph_impl knot_resolver_latency_graph;
 
 #endif /* TELEMETRY_GRAPH_KNOT_RESOLVER_H */