Master-process initialization time stats (#932)

A preparation for ML runtime that could be time consuming
We want to have some metrics to monitor

server/php-engine.cpp

@@ -63,6 +63,7 @@
 #include "runtime/rpc.h"
 #include "runtime/thread-pool.h"
 #include "server/confdata-binlog-replay.h"
+#include "server/confdata-stats.h"
 #include "server/database-drivers/adaptor.h"
 #include "server/database-drivers/connector.h"
 #include "server/job-workers/job-worker-client.h"
@@ -1641,6 +1642,8 @@ char **get_runtime_options(int *count) noexcept;
 void init_all() {
   srand48((long)cycleclock_now());
 
+  auto start_time = std::chrono::steady_clock::now();
+
   //init pending_http_queue
   pending_http_queue.first_query = pending_http_queue.last_query = (conn_query *)&pending_http_queue;
   php_worker_run_flag = 0;
@@ -1674,6 +1677,10 @@ void init_all() {
   worker_id = (int)lrand48();
 
   init_confdata_binlog_reader();
+
+  auto end_time = std::chrono::steady_clock::now();
+  uint64_t total_init_ns = std::chrono::duration_cast<std::chrono::nanoseconds>(start_time - end_time).count();
+  StatsHouseManager::get().add_init_master_stats(total_init_ns, ConfdataStats::get().initial_loading_time.count());
 }
 
 void init_logname(const char *src) {

server/statshouse/statshouse-manager.cpp

@@ -244,6 +244,11 @@ void StatsHouseManager::add_common_master_stats(const workers_stats_t &workers_s
   }
 }
 
+void StatsHouseManager::add_init_master_stats(uint64_t total_init_ns, uint64_t confdata_init_ns) {
+  client.metric("kphp_by_host_master_total_init_time", true).write_value(total_init_ns);
+  client.metric("kphp_by_host_master_confdata_init_time", true).write_value(confdata_init_ns);
+}
+
 void StatsHouseManager::add_job_workers_shared_memory_stats(const job_workers::JobStats &job_stats) {
   using namespace job_workers;
 

server/statshouse/statshouse-manager.h

@@ -61,6 +61,11 @@ class StatsHouseManager : vk::not_copyable {
   void add_common_master_stats(const workers_stats_t &workers_stats, const memory_resource::MemoryStats &memory_stats, double cpu_s_usage, double cpu_u_usage,
                                long long int instance_cache_memory_swaps_ok, long long int instance_cache_memory_swaps_fail);
 
+  /**
+   * Must be called from master process only
+   */
+  void add_init_master_stats(uint64_t total_init_ns, uint64_t confdata_init_ns);
+
 private:
   StatsHouseClient client;
   bool need_write_enable_tag_host = false;