Review Videos! • clocks, clock_cast, leap_seconds (https://youtu.be/WX3OmVu4lAs) • time_zone and time_zone_link (https://youtu.be/MODhhr7m-5s) • system_clock::now(), file_clock, leap second awareness (https://youtu Plus, the types often end up boiling down to constants anyway!18 Part III: Clocks19 What is a clock? #include #include using namespace std::chrono; class MyClock { public: is_steady = false; static time_point now() {} }; static_assert(is_clock_v); For a type T to qualify as a Clock, it must satisfy each of the following conditions: • The following qualified-ids

in :  std::system_clock: wall clock time from system-wide real-time clock  std::steady_clock: guarantees it never goes backwards  std::high_resolution_clock: has shortest possible tick C++20 adds:  utc_clock, tai_clock, gps_clock, and file_clock  Every clock has a now() method21 Clocks – Examples  Example: // Get current time as a time_point. system_clock::time_point tpoint tpoint { system_clock::now() }; // Or: auto tpoint { system_clock::now() }; // Convert to a time_t. time_t tt { system_clock::to_time_t(tpoint) }; // Convert to local time. tm* t { localtime(&tt) }; // Write

uint64_t CPU_CLOCK_HZ = 400'000'000; // API to implement: std::chrono::nanoseconds elapsed_time(uint64_t num_cpu_ticks); 1 2 3 4 8Example: “CPU ticks” time units constexpr uint64_t CPU_CLOCK_HZ = 400'000'000; nds elapsed_time(uint64_t num_cpu_ticks) { using NS_PER_TICK = std::ratio<1'000'000'000, CPU_CLOCK_HZ>; return std::chrono::nanoseconds{ num_cpu_ticks * NS_PER_TICK::num / NS_PER_TICK::den NS_PER_TICK::den }; } 1 2 3 4 5 6 8.1Example: “CPU ticks” time units constexpr uint64_t CPU_CLOCK_HZ = 400'000'000; // API to implement: std::chrono::nanoseconds elapsed_time(uint64_t num_cpu_ticks); 1 2

problems than can be displayed according to the Show lines setting – Digital clock will no longer be displayed in the Clock widget footer • In the new Kiosk mode, widgets only can be displayed with no - visual unit displaying information of a certain kind and source (a summary, a map, a graph, the clock, etc.), used in the dashboard. Zabbix API - Zabbix API allows you to use the JSON RPC protocol to documentation if needed. 1.4 Changing time zone By default the appliance uses UTC for the system clock. To change the time zone, copy the appropriate file from /usr/share/zoneinfo to /etc/localtime, for

- visual unit displaying information of a certain kind and source (a summary, a map, a graph, the clock, etc), used in the dashboard. Zabbix API - Zabbix API allows you to use the JSON RPC protocol to nameserver 192.168.1.2. 1.5 Changing time zone By default the appliance uses UTC for the system clock. To change the time zone, copy the appropriate file from /usr/share/zoneinfo to /etc/localtime, for Attention: The elements that can be included in a template screen are: simple graph, custom graph, clock, plain text, URL. Note: For details on accessing host screens that are created from template screens

"number_of_shards" : 5 } }, "mappings" : { "values" : { "properties" : { "itemid" : { "type" : "long" }, "clock" : { "format" : "epoch_second", "type" : "date" }, "value" : { "fields" : { "analyzed" : { "index" "number_of_shards" : 5 } }, "mappings" : { "values" : { "properties" : { "itemid" : { "type" : "long" }, "clock" : { "format" : "epoch_second", "type" : "date" }, "value" : { "type" : "long" } } } } }' 要创建其他模板，用户应更改请求 "number_of_shards" : 5 } }, "mappings" : { "values" : { "properties" : { "itemid" : { "type" : "long" }, "clock" : { "format" : "epoch_second", "type" : "date" }, "value" : { "fields" : { "analyzed" : { "index"

template dashboards Previously, on a template dashboard, you could create only the following widgets: Clock, Graph (classic), Graph prototype, Item value, Plain text, URL. Now template dashboards support replaced with col- lapsible blocks (see, for example, Connector configuration, Service configuration, Clock widget configuration, etc.). This improves user experience, as collapsing these blocks and saving - visual unit displaying information of a certain kind and source (a summary, a map, a graph, the clock, etc.), used in the dashboard. Zabbix API - Zabbix API allows you to use the JSON RPC protocol to

YAML 保存到 grandmaster- clock-ptp-config.yaml 文件中： 例 例 19.1. PTP grandmaster 时钟 时钟配置示例 配置示例 apiVersion: ptp.openshift.io/v1 kind: PtpConfig metadata: name: grandmaster-clock namespace: openshift-ptp openshift-ptp annotations: {} spec: profile: - name: grandmaster-clock # The interface name is hardware-specific interface: $interface ptp4lOpts: "-2" phc2sysOpts: "-a -r -r -n 24" verbose 0 summary_interval 0 kernel_leap 1 check_fup_sync 0 clock_class_threshold 7 # # Servo Options # pi_proportional_const 0.0

"number_of_shards" : 5 } }, "mappings" : { "values" : { "properties" : { "itemid" : { "type" : "long" }, "clock" : { "format" : "epoch_second", "type" : "date" }, "value" : { "fields" : { "analyzed" : { "index" "number_of_shards" : 5 } }, "mappings" : { "values" : { "properties" : { "itemid" : { "type" : "long" }, "clock" : { "format" : "epoch_second", "type" : "date" }, "value" : { "type" : "long" } } } } }' 要创建其他模板，用户应更改请求 "number_of_shards" : 5 } }, "mappings" : { "values" : { "properties" : { "itemid" : { "type" : "long" }, "clock" : { "format" : "epoch_second", "type" : "date" }, 15 "value" : { "fields" : { "analyzed" :

of widget. For example: No refresh for URL widget, 1 minute for action log widget, 15 minutes for clock widget. 10 What’s new in Zabbix 3.4.5 Configurable URI validation URI validation, introduced in - visual unit displaying information of a certain kind and source (a summary, a map, a graph, the clock, etc), used in the dashboard. Zabbix API - Zabbix API allows you to use the JSON RPC protocol to nameserver 192.168.1.2. 1.5 Changing time zone By default the appliance uses UTC for the system clock. To change the time zone, copy the appropriate file from /usr/share/zoneinfo to /etc/localtime, for