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72 lines
2.5 KiB
Lua
72 lines
2.5 KiB
Lua
--
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-- (C) 2019 - ntop.org
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--
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local alerts_api = require("alerts_api")
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local alert_consts = require("alert_consts")
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local check_module
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-- #################################################################
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local function request_reply_ratio(params)
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local info = params.entity_info
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-- {requests, replies}
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local to_check = {}
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if(info["dns"] ~= nil) then
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to_check["dns_sent"] = {info["dns"]["sent"]["num_queries"], (info["dns"]["rcvd"]["num_replies_ok"] + info["dns"]["rcvd"]["num_replies_error"])}
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to_check["dns_rcvd"] = {info["dns"]["rcvd"]["num_queries"], (info["dns"]["sent"]["num_replies_ok"] + info["dns"]["sent"]["num_replies_error"])}
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end
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if(info["http"] ~= nil) then
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to_check["http_sent"] = {info["http"]["sender"]["query"]["total"], info["http"]["receiver"]["response"]["total"]}
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to_check["http_rcvd"] = {info["http"]["receiver"]["query"]["total"], info["http"]["sender"]["response"]["total"]}
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end
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for key, values in pairs(to_check) do
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local to_check_key = check_module.key .. "__" .. key
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-- true to avoid generating an alert due to a value just restored from redis
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local skip_first = true
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local requests = alerts_api.host_delta_val(to_check_key .. "_requests", params.granularity, values[1], skip_first)
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local replies = alerts_api.host_delta_val(to_check_key .. "_replies", params.granularity, values[2], skip_first)
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local ratio = (replies * 100) / (requests+1)
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local req_repl_type = alerts_api.requestReplyRatioType(key, requests, replies, params.granularity)
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-- 10: some meaningful value
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if((requests + replies > 10) and (ratio < tonumber(params.alert_config.edge))) then
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alerts_api.trigger(params.alert_entity, req_repl_type)
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else
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alerts_api.release(params.alert_entity, req_repl_type)
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end
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end
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end
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-- #################################################################
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check_module = {
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key = "request_reply_ratio",
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check_function = request_reply_ratio,
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local_only = true,
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nedge_exclude = true,
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default_values = {
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["5mins"] = "request_reply_ratio;lt;50", -- 50%
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},
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gui = {
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i18n_title = "entity_thresholds.request_reply_ratio_title",
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i18n_description = "entity_thresholds.request_reply_ratio_description",
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i18n_field_unit = alert_consts.field_units.percentage,
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input_builder = alerts_api.threshold_cross_input_builder,
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field_max = 100,
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field_min = 1,
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field_operator = "lt";
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}
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}
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-- #################################################################
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return check_module
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