add some doc

conf/input.http_response/http_response.toml

@@ -1,11 +1,11 @@
 # # collect interval
 # interval = 15
 
-[[instances]]
-targets = [
-    "http://localhost",
-    "https://www.baidu.com"
-]
+# [[instances]]
+# targets = [
+#     "http://localhost",
+#     "https://www.baidu.com"
+# ]
 
 # # append some labels for series
 # labels = { region="cloud", product="n9e" }

inputs/http_response/README.md

@@ -1,4 +1,8 @@
-### code meanings
+# http_response
+
+HTTP 探测插件，用于检测 HTTP 地址的连通性、延迟、HTTPS证书过期时间
+
+## code meanings
 
 ```
 Success          = 0
@@ -9,3 +13,36 @@ AddressError     = 4
 BodyMismatch     = 5
 CodeMismatch     = 6
 ```
+
+## Configuration
+
+最核心的配置就是 targets 配置，配置目标地址，比如想要监控两个地址：
+
+```toml
+[[instances]]
+targets = [
+    "http://localhost:8080",
+    "https://www.baidu.com"
+]
+```
+
+instances 下面的所有 targets 共享同一个 `[[instances]]` 下面的配置，比如超时时间，HTTP方法等，如果有些配置不同，可以拆成多个不同的 `[[instances]]`，比如：
+
+```toml
+[[instances]]
+targets = [
+    "http://localhost:8080",
+    "https://www.baidu.com"
+]
+method = "GET"
+
+[[instances]]
+targets = [
+    "http://localhost:9090"
+]
+method = "POST"
+```
+
+## 监控大盘和告警规则
+
+该 README 的同级目录下，提供了 dashboard.json 就是监控大盘的配置，alerts.json 是告警规则，可以导入夜莺使用。

inputs/kernel/README.md

@@ -0,0 +1,7 @@
+# kernel
+
+采集本机的内核信息，比如 OS 启动时间，上下文切换的次数等
+
+## 监控大盘
+
+该插件没有单独的监控大盘，OS 的监控大盘统一放到 system 下面了

inputs/kernel_vmstat/README.md

@@ -0,0 +1,126 @@
+# kernel_vmstat
+
+该监控插件采集的是 `/proc/vmstat` 的指标数据，需要较高版本的 kernel，`/proc/vmstat`内容较多，配置文件中给了一个白名单的配置，大家按需启用，只有启用了才会采集。
+
+```ini
+[white_list]
+oom_kill = 1
+nr_free_pages = 0
+nr_alloc_batch = 0
+nr_inactive_anon = 0
+nr_active_anon = 0
+nr_inactive_file = 0
+nr_active_file = 0
+nr_unevictable = 0
+nr_mlock = 0
+nr_anon_pages = 0
+nr_mapped = 0
+nr_file_pages = 0
+nr_dirty = 0
+nr_writeback = 0
+nr_slab_reclaimable = 0
+nr_slab_unreclaimable = 0
+nr_page_table_pages = 0
+nr_kernel_stack = 0
+nr_unstable = 0
+nr_bounce = 0
+nr_vmscan_write = 0
+nr_vmscan_immediate_reclaim = 0
+nr_writeback_temp = 0
+nr_isolated_anon = 0
+nr_isolated_file = 0
+nr_shmem = 0
+nr_dirtied = 0
+nr_written = 0
+numa_hit = 0
+numa_miss = 0
+numa_foreign = 0
+numa_interleave = 0
+numa_local = 0
+numa_other = 0
+workingset_refault = 0
+workingset_activate = 0
+workingset_nodereclaim = 0
+nr_anon_transparent_hugepages = 0
+nr_free_cma = 0
+nr_dirty_threshold = 0
+nr_dirty_background_threshold = 0
+pgpgin = 0
+pgpgout = 0
+pswpin = 0
+pswpout = 0
+pgalloc_dma = 0
+pgalloc_dma32 = 0
+pgalloc_normal = 0
+pgalloc_movable = 0
+pgfree = 0
+pgactivate = 0
+pgdeactivate = 0
+pgfault = 0
+pgmajfault = 0
+pglazyfreed = 0
+pgrefill_dma = 0
+pgrefill_dma32 = 0
+pgrefill_normal = 0
+pgrefill_movable = 0
+pgsteal_kswapd_dma = 0
+pgsteal_kswapd_dma32 = 0
+pgsteal_kswapd_normal = 0
+pgsteal_kswapd_movable = 0
+pgsteal_direct_dma = 0
+pgsteal_direct_dma32 = 0
+pgsteal_direct_normal = 0
+pgsteal_direct_movable = 0
+pgscan_kswapd_dma = 0
+pgscan_kswapd_dma32 = 0
+pgscan_kswapd_normal = 0
+pgscan_kswapd_movable = 0
+pgscan_direct_dma = 0
+pgscan_direct_dma32 = 0
+pgscan_direct_normal = 0
+pgscan_direct_movable = 0
+pgscan_direct_throttle = 0
+zone_reclaim_failed = 0
+pginodesteal = 0
+slabs_scanned = 0
+kswapd_inodesteal = 0
+kswapd_low_wmark_hit_quickly = 0
+kswapd_high_wmark_hit_quickly = 0
+pageoutrun = 0
+allocstall = 0
+pgrotated = 0
+drop_pagecache = 0
+drop_slab = 0
+numa_pte_updates = 0
+numa_huge_pte_updates = 0
+numa_hint_faults = 0
+numa_hint_faults_local = 0
+numa_pages_migrated = 0
+pgmigrate_success = 0
+pgmigrate_fail = 0
+compact_migrate_scanned = 0
+compact_free_scanned = 0
+compact_isolated = 0
+compact_stall = 0
+compact_fail = 0
+compact_success = 0
+htlb_buddy_alloc_success = 0
+htlb_buddy_alloc_fail = 0
+unevictable_pgs_culled = 0
+unevictable_pgs_scanned = 0
+unevictable_pgs_rescued = 0
+unevictable_pgs_mlocked = 0
+unevictable_pgs_munlocked = 0
+unevictable_pgs_cleared = 0
+unevictable_pgs_stranded = 0
+thp_fault_alloc = 0
+thp_fault_fallback = 0
+thp_collapse_alloc = 0
+thp_collapse_alloc_failed = 0
+thp_split = 0
+thp_zero_page_alloc = 0
+thp_zero_page_alloc_failed = 0
+balloon_inflate = 0
+balloon_deflate = 0
+balloon_migrate = 0
+```

inputs/linux_sysctl_fs/README.md

@@ -0,0 +1,3 @@
+# linux_sysctl_fs
+
+采集一些 /proc/sys/fs 下的内容

inputs/mem/README.md

@@ -0,0 +1,7 @@
+# mem
+
+内存采集插件，维持默认配置即可。
+
+## 监控大盘
+
+该插件没有单独的监控大盘，OS 的监控大盘统一放到 system 下面了