MINOR: stats: add new start time field

Another patch in order to try to reconciliate haproxy stats and
prometheus. Here I'm adding a proper start time field in order to make
proper use of uptime field.
That being done we can move the calculation in `fill_info`

Signed-off-by: William Dauchy <wdauchy@gmail.com>

3 files changed, 11 insertions, 6 deletions

diff --git a/contrib/prometheus-exporter/service-prometheus.c b/contrib/prometheus-exporter/service-prometheus.c
index f636777bc..3c5663a94 100644
--- a/contrib/prometheus-exporter/service-prometheus.c
+++ b/contrib/prometheus-exporter/service-prometheus.c
@@ -99,7 +99,8 @@ const int promex_global_metrics[INF_TOTAL_FIELDS] = {
 	[INF_PROCESS_NUM]                    = INF_UPTIME_SEC,
 	[INF_PID]                            = 0,
 	[INF_UPTIME]                         = 0,
-	[INF_UPTIME_SEC]                     = INF_MEMMAX_BYTES,
+	[INF_UPTIME_SEC]                     = INF_START_TIME_SEC,
+	[INF_START_TIME_SEC]                 = INF_MEMMAX_BYTES,
 	[INF_MEMMAX_BYTES]                   = INF_POOL_ALLOC_BYTES,
 	[INF_POOL_ALLOC_BYTES]               = INF_POOL_USED_BYTES,
 	[INF_POOL_USED_BYTES]                = INF_POOL_FAILED,
@@ -481,7 +482,8 @@ const struct ist promex_inf_metric_names[INF_TOTAL_FIELDS] = {
 	[INF_PROCESS_NUM]                    = IST("relative_process_id"),
 	[INF_PID]                            = IST("pid"),
 	[INF_UPTIME]                         = IST("uptime"),
-	[INF_UPTIME_SEC]                     = IST("start_time_seconds"),
+	[INF_UPTIME_SEC]                     = IST("uptime_seconds"),
+	[INF_START_TIME_SEC]                 = IST("start_time_seconds"),
 	[INF_MEMMAX_BYTES]                   = IST("max_memory_bytes"),
 	[INF_POOL_ALLOC_BYTES]               = IST("pool_allocated_bytes"),
 	[INF_POOL_USED_BYTES]                = IST("pool_used_bytes"),
@@ -654,7 +656,8 @@ const struct ist promex_inf_metric_desc[INF_TOTAL_FIELDS] = {
 	[INF_PROCESS_NUM]                    = IST("Relative process id, starting at 1."),
 	[INF_PID]                            = IST("HAProxy PID."),
 	[INF_UPTIME]                         = IST("Uptime in a human readable format."),
-	[INF_UPTIME_SEC]                     = IST("Start time in seconds."),
+	[INF_UPTIME_SEC]                     = IST("Uptime in seconds."),
+	[INF_START_TIME_SEC]                 = IST("Start time in seconds."),
 	[INF_MEMMAX_BYTES]                   = IST("Per-process memory limit (in bytes); 0=unset."),
 	[INF_POOL_ALLOC_BYTES]               = IST("Total amount of memory allocated in pools (in bytes)."),
 	[INF_POOL_USED_BYTES]                = IST("Total amount of memory used in pools (in bytes)."),
@@ -828,6 +831,7 @@ const struct ist promex_inf_metric_labels[INF_TOTAL_FIELDS] = {
 	[INF_PID]                            = IST(""),
 	[INF_UPTIME]                         = IST(""),
 	[INF_UPTIME_SEC]                     = IST(""),
+	[INF_START_TIME_SEC]                 = IST(""),
 	[INF_MEMMAX_BYTES]                   = IST(""),
 	[INF_POOL_ALLOC_BYTES]               = IST(""),
 	[INF_POOL_USED_BYTES]                = IST(""),
@@ -994,6 +998,7 @@ const struct ist promex_inf_metric_types[INF_TOTAL_FIELDS] = {
 	[INF_PID]                            = IST("untyped"),
 	[INF_UPTIME]                         = IST("untyped"),
 	[INF_UPTIME_SEC]                     = IST("gauge"),
+	[INF_START_TIME_SEC]                 = IST("gauge"),
 	[INF_MEMMAX_BYTES]                   = IST("gauge"),
 	[INF_POOL_ALLOC_BYTES]               = IST("gauge"),
 	[INF_POOL_USED_BYTES]                = IST("gauge"),
@@ -1333,9 +1338,6 @@ static int promex_dump_global_metrics(struct appctx *appctx, struct htx *htx)
 			case INF_BUILD_INFO:
 				metric = mkf_u32(FN_GAUGE, 1);
 				break;
-			case INF_UPTIME_SEC:
-				metric = mkf_u32(FN_DURATION, start_date.tv_sec);
-				break;
 
 			default:
 				metric = info[appctx->st2];
diff --git a/include/haproxy/stats-t.h b/include/haproxy/stats-t.h
index d396ac24a..c3fc21b46 100644
--- a/include/haproxy/stats-t.h
+++ b/include/haproxy/stats-t.h
@@ -327,6 +327,7 @@ enum info_field {
 	INF_MEMMAX_BYTES,
 	INF_POOL_ALLOC_BYTES,
 	INF_POOL_USED_BYTES,
+	INF_START_TIME_SEC,
 
 	/* must always be the last one */
 	INF_TOTAL_FIELDS
diff --git a/src/stats.c b/src/stats.c
index 73bd68a7b..fc8f68b39 100644
--- a/src/stats.c
+++ b/src/stats.c
@@ -91,6 +91,7 @@ const struct name_desc info_fields[INF_TOTAL_FIELDS] = {
 	[INF_PID]                            = { .name = "Pid",                         .desc = "This worker process identifier for the system" },
 	[INF_UPTIME]                         = { .name = "Uptime",                      .desc = "How long ago this worker process was started (days+hours+minutes+seconds)" },
 	[INF_UPTIME_SEC]                     = { .name = "Uptime_sec",                  .desc = "How long ago this worker process was started (seconds)" },
+	[INF_START_TIME_SEC]                 = { .name = "Start_time_sec",              .desc = "Start time in seconds" },
 	[INF_MEMMAX_MB]                      = { .name = "Memmax_MB",                   .desc = "Worker process's hard limit on memory usage in MB (-m on command line)" },
 	[INF_MEMMAX_BYTES]                   = { .name = "Memmax_bytes",                .desc = "Worker process's hard limit on memory usage in byes (-m on command line)" },
 	[INF_POOL_ALLOC_MB]                  = { .name = "PoolAlloc_MB",                .desc = "Amount of memory allocated in pools (in MB)" },
@@ -3851,6 +3852,7 @@ int stats_fill_info(struct field *info, int len)
 	chunk_appendf(out, "%ud %uh%02um%02us", up / 86400, (up % 86400) / 3600, (up % 3600) / 60, (up % 60));
 
 	info[INF_UPTIME_SEC]                     = mkf_u32(FN_DURATION, up);
+	info[INF_START_TIME_SEC]                 = mkf_u32(FN_DURATION, start_date.tv_sec);
 	info[INF_MEMMAX_MB]                      = mkf_u32(FO_CONFIG|FN_LIMIT, global.rlimit_memmax);
 	info[INF_MEMMAX_BYTES]                   = mkf_u32(FO_CONFIG|FN_LIMIT, global.rlimit_memmax * 1048576L);
 	info[INF_POOL_ALLOC_MB]                  = mkf_u32(0, (unsigned)(pool_total_allocated() / 1048576L));