Only process some metrics when OpenTSDB is enabled to solve bosun_uptime metric missing issue

This release contains latest upstream along with below pending patches

bosun-monitor#2277 - Fix delay close alert notification (branch origin/fix_delayclose)
bosun-monitor#2415 - Improve logs (branch origin/improve_alert_execution_logs)
bosun-monitor#2396 - pass alert variables to unknown notification templates (branch origin/pass-alert-variables-to-unknown-notification-templates)
bosun-monitor#2397 - Change errors page (branch origin/errors_fix)
bosun-monitor#2447 - Fix crash while try to get silenced + redis down (branch origin/fix_crash_while_redis_down)
bosun-monitor#2448 - Fix rulecheck indicator in /api/health API (branch origin/fix_api_health_rule_check)
bosun-monitor#2459 - Reimplement incident data fetch for dashboard page (branch origin/refactor_dashboard)
bosun-monitor#2465 - Set real hostname to service http header X-Bosun-Server (branch origin/fix_x_bosun_header)
bosun-monitor#2472 - First raft-based cluster implementation for bosun, reload config fixes, timeouts settings for raft (branch origin/raft_cluster), add external memberlist file support, fixes for unknown notifications, UI for manage cluster
bosun-monitor#2471 - Make it possible to control decision about unknown state (branch origin/control_unknown_untouched_decision)
bosun-monitor#2501 - Improve post notification metrics (branch origin/notification_failure_metrics)
bosun-monitor#2502 - Enable scheduled web cache cleanup (branch origin/cache-improvement)
bosun-monitor#2503 - Only process some metrics when OpenTSDB is enabled (branch origin/skip-tsdb-metrics)

Improve post notification metrics and enable scheduled web cache cleanup

This release contains latest upstream along with below pending patches

bosun-monitor#2277 - Fix delay close alert notification (branch origin/fix_delayclose)
bosun-monitor#2415 - Improve logs (branch origin/improve_alert_execution_logs)
bosun-monitor#2396 - pass alert variables to unknown notification templates (branch origin/pass-alert-variables-to-unknown-notification-templates)
bosun-monitor#2397 - Change errors page (branch origin/errors_fix)
bosun-monitor#2447 - Fix crash while try to get silenced + redis down (branch origin/fix_crash_while_redis_down)
bosun-monitor#2448 - Fix rulecheck indicator in /api/health API (branch origin/fix_api_health_rule_check)
bosun-monitor#2459 - Reimplement incident data fetch for dashboard page (branch origin/refactor_dashboard)
bosun-monitor#2465 - Set real hostname to service http header X-Bosun-Server (branch origin/fix_x_bosun_header)
bosun-monitor#2472 - First raft-based cluster implementation for bosun, reload config fixes, timeouts settings for raft (branch origin/raft_cluster), add external memberlist file support, fixes for unknown notifications, UI for manage cluster
bosun-monitor#2471 - Make it possible to control decision about unknown state (branch origin/control_unknown_untouched_decision)
bosun-monitor#2501 - Improve post notification metrics (branch origin/notification_failure_metrics)
bosun-monitor#2502 - Enable scheduled web cache cleanup (branch origin/cache-improvement)

Sync with upstream latest commits

This release contains latest upstream along with below pending patches

bosun-monitor#2277 - Fix delay close alert notification (branch origin/fix_delayclose)
bosun-monitor#2415 - Improve logs (branch origin/improve_alert_execution_logs)
bosun-monitor#2396 - pass alert variables to unknown notification templates (branch origin/pass-alert-variables-to-unknown-notification-templates)
bosun-monitor#2397 - Change errors page (branch origin/errors_fix)
bosun-monitor#2447 - Fix crash while try to get silenced + redis down (branch origin/fix_crash_while_redis_down)
bosun-monitor#2448 - Fix rulecheck indicator in /api/health API (branch origin/fix_api_health_rule_check)
bosun-monitor#2459 - Reimplement incident data fetch for dashboard page (branch origin/refactor_dashboard)
bosun-monitor#2465 - Set real hostname to service http header X-Bosun-Server (branch origin/fix_x_bosun_header)
bosun-monitor#2472 - First raft-based cluster implementation for bosun, reload config fixes, timeouts settings for raft (branch origin/raft_cluster), add external memberlist file support, fixes for unknown notifications, UI for manage cluster
bosun-monitor#2471 - Make it possible to control decision about unknown state (branch origin/control_unknown_untouched_decision)

This release removes patches below since they're merged into upstream

bosun-monitor#2440 - ElasticSearch 7.x support (branch origin/es7-support-2)
bosun-monitor#2468 - Fix panic in timedelta expression if series are empty (branch origin/fix_timedelta_empty_series)

Add tests and documentation for cluster

This release contains latest upstream along with below pending patches

bosun-monitor#2277 - Fix delay close alert notification (branch origin/fix_delayclose)
bosun-monitor#2415 - Improve logs (branch origin/improve_alert_execution_logs)
bosun-monitor#2396 - pass alert variables to unknown notification templates (branch origin/pass-alert-variables-to-unknown-notification-templates)
bosun-monitor#2397 - Change errors page (branch origin/errors_fix)
bosun-monitor#2440 - ElasticSearch 7.x support (branch origin/es7-support-2)
bosun-monitor#2448 - Fix rulecheck indicator in /api/health API (branch origin/fix_api_health_rule_check)
bosun-monitor#2447 - Fix crash while try to get silenced + redis down (branch origin/fix_crash_while_redis_down)
bosun-monitor#2459 - Reimplement incident data fetch for dashboard page (branch origin/refactor_dashboard)
bosun-monitor#2465 - Set real hostname to service http header X-Bosun-Server (branch origin/fix_x_bosun_header)
bosun-monitor#2468 - Fix panic in timedelta expression if series are empty (branch origin/fix_timedelta_empty_series)
bosun-monitor#2472 - First raft-based cluster implementation for bosun, reload config fixes, timeouts settings for raft (branch origin/raft_cluster), add external memberlist file support, fixes for unknown notifications, UI for manage cluster
bosun-monitor#2471 - Make it possible to control decision about unknown state (branch origin/control_unknown_untouched_decision)

Make it possible to control decision about unknown state while untouched

This release contains latest upstream along with below pending patches

bosun-monitor#2277 - Fix delay close alert notification (branch origin/fix_delayclose)
bosun-monitor#2415 - Improve logs (branch origin/improve_alert_execution_logs)
bosun-monitor#2396 - pass alert variables to unknown notification templates (branch origin/pass-alert-variables-to-unknown-notification-templates)
bosun-monitor#2397 - Change errors page (branch origin/errors_fix)
bosun-monitor#2440 - ElasticSearch 7.x support (branch origin/es7-support-2)
bosun-monitor#2448 - Fix rulecheck indicator in /api/health API (branch origin/fix_api_health_rule_check)
bosun-monitor#2447 - Fix crash while try to get silenced + redis down (branch origin/fix_crash_while_redis_down)
bosun-monitor#2459 - Reimplement incident data fetch for dashboard page (branch origin/refactor_dashboard)
bosun-monitor#2465 - Set real hostname to service http header X-Bosun-Server (branch origin/fix_x_bosun_header)
bosun-monitor#2468 - Fix panic in timedelta expression if series are empty (branch origin/fix_timedelta_empty_series)
bosun-monitor#2441 - First raft-based cluster implementation for bosun, reload config fixes, timeouts settings for raft (branch origin/raft_cluster_implementation_integrate), add external memberlist file support, fixes for unknown notifications, UI for manage cluster
bosun-monitor#2471 - Make it possible to control decision about unknown state (branch origin/control_unknown_untouched_decision)

Add extended raft statistics

This release contains latest upstream along with below pending patches

bosun-monitor#2277 - Fix delay close alert notification (branch origin/fix_delayclose)
bosun-monitor#2415 - Improve logs (branch origin/improve_alert_execution_logs)
bosun-monitor#2396 - pass alert variables to unknown notification templates (branch origin/pass-alert-variables-to-unknown-notification-templates)
bosun-monitor#2397 - Change errors page (branch origin/errors_fix)
bosun-monitor#2440 - ElasticSearch 7.x support (branch origin/es7-support-2)
bosun-monitor#2448 - Fix rulecheck indicator in /api/health API (branch origin/fix_api_health_rule_check)
bosun-monitor#2447 - Fix crash while try to get silenced + redis down (branch origin/fix_crash_while_redis_down)
bosun-monitor#2459 - Reimplement incident data fetch for dashboard page (branch origin/refactor_dashboard)
bosun-monitor#2465 - Set real hostname to service http header X-Bosun-Server (branch origin/fix_x_bosun_header)
bosun-monitor#2468 - Fix panic in timedelta expression if series are empty (branch origin/fix_timedelta_empty_series)
bosun-monitor#2441 - First raft-based cluster implementation for bosun, reload config fixes, timeouts settings for raft (branch origin/raft_cluster_implementation_integrate), add external memberlist file support, fixes for unknown notifications, UI for manage cluster

Add extra Prometheus statisitics

This release contains latest upstream along with below pending patches

bosun-monitor#2277 - Fix delay close alert notification (branch origin/fix_delayclose)
bosun-monitor#2415 - Improve logs (branch origin/improve_alert_execution_logs)
bosun-monitor#2396 - pass alert variables to unknown notification templates (branch origin/pass-alert-variables-to-unknown-notification-templates)
bosun-monitor#2397 - Change errors page (branch origin/errors_fix)
bosun-monitor#2440 - ElasticSearch 7.x support (branch origin/es7-support-2)
bosun-monitor#2448 - Fix rulecheck indicator in /api/health API (branch origin/fix_api_health_rule_check)
bosun-monitor#2447 - Fix crash while try to get silenced + redis down (branch origin/fix_crash_while_redis_down)
bosun-monitor#2459 - Reimplement incident data fetch for dashboard page (branch origin/refactor_dashboard)
bosun-monitor#2465 - Set real hostname to service http header X-Bosun-Server (branch origin/fix_x_bosun_header)
bosun-monitor#2468 - Fix panic in timedelta expression if series are empty (branch origin/fix_timedelta_empty_series)
bosun-monitor#2441 - First raft-based cluster implementation for bosun, reload config fixes, timeouts settings for raft (branch origin/raft_cluster_implementation_integrate), add external memberlist file support, fixes for unknown notifications, UI for manage cluster

Fix changing persistent data from follower nodes

This release contains latest upstream along with below pending patches

bosun-monitor#2277 - Fix delay close alert notification (branch origin/fix_delayclose)
bosun-monitor#2415 - Improve logs (branch origin/improve_alert_execution_logs)
bosun-monitor#2396 - pass alert variables to unknown notification templates (branch origin/pass-alert-variables-to-unknown-notification-templates)
bosun-monitor#2397 - Change errors page (branch origin/errors_fix)
bosun-monitor#2440 - ElasticSearch 7.x support (branch origin/es7-support-2)
bosun-monitor#2448 - Fix rulecheck indicator in /api/health API (branch origin/fix_api_health_rule_check)
bosun-monitor#2447 - Fix crash while try to get silenced + redis down (branch origin/fix_crash_while_redis_down)
bosun-monitor#2459 - Reimplement incident data fetch for dashboard page (branch origin/refactor_dashboard)
bosun-monitor#2465 - Set real hostname to service http header X-Bosun-Server (branch origin/fix_x_bosun_header)
bosun-monitor#2468 - Fix panic in timedelta expression if series are empty (branch origin/fix_timedelta_empty_series)
bosun-monitor#2441 - First raft-based cluster implementation for bosun, reload config fixes, timeouts settings for raft (branch origin/raft_cluster_implementation_integrate), add external memberlist file support, fixes for unknown notifications, UI for manage cluster

Fix permissions for cluster mmanagement page

This release contains latest upstream along with below pending patches

bosun-monitor#2277 - Fix delay close alert notification (branch origin/fix_delayclose)
bosun-monitor#2415 - Improve logs (branch origin/improve_alert_execution_logs)
bosun-monitor#2396 - pass alert variables to unknown notification templates (branch origin/pass-alert-variables-to-unknown-notification-templates)
bosun-monitor#2397 - Change errors page (branch origin/errors_fix)
bosun-monitor#2440 - ElasticSearch 7.x support (branch origin/es7-support-2)
bosun-monitor#2448 - Fix rulecheck indicator in /api/health API (branch origin/fix_api_health_rule_check)
bosun-monitor#2447 - Fix crash while try to get silenced + redis down (branch origin/fix_crash_while_redis_down)
bosun-monitor#2459 - Reimplement incident data fetch for dashboard page (branch origin/refactor_dashboard)
bosun-monitor#2465 - Set real hostname to service http header X-Bosun-Server (branch origin/fix_x_bosun_header)
bosun-monitor#2468 - Fix panic in timedelta expression if series are empty (branch origin/fix_timedelta_empty_series)
bosun-monitor#2441 - First raft-based cluster implementation for bosun, reload config fixes, timeouts settings for raft (branch origin/raft_cluster_implementation_integrate), add external memberlist file support, fixes for unknown notifications, UI for manage cluster

Improve Bosun clustering

This release contains latest upstream along with below pending patches

bosun-monitor#2277 - Fix delay close alert notification (branch origin/fix_delayclose)
bosun-monitor#2415 - Improve logs (branch origin/improve_alert_execution_logs)
bosun-monitor#2396 - pass alert variables to unknown notification templates (branch origin/pass-alert-variables-to-unknown-notification-templates)
bosun-monitor#2397 - Change errors page (branch origin/errors_fix)
bosun-monitor#2440 - ElasticSearch 7.x support (branch origin/es7-support-2)
bosun-monitor#2448 - Fix rulecheck indicator in /api/health API (branch origin/fix_api_health_rule_check)
bosun-monitor#2447 - Fix crash while try to get silenced + redis down (branch origin/fix_crash_while_redis_down)
bosun-monitor#2459 - Reimplement incident data fetch for dashboard page (branch origin/refactor_dashboard)
bosun-monitor#2465 - Set real hostname to service http header X-Bosun-Server (branch origin/fix_x_bosun_header)
bosun-monitor#2468 - Fix panic in timedelta expression if series are empty (branch origin/fix_timedelta_empty_series)
bosun-monitor#2441 - First raft-based cluster implementation for bosun, reload config fixes, timeouts settings for raft (branch origin/raft_cluster_implementation_integrate), add external memberlist file support, fixes for unknown notifications, UI for manage cluster