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* +metrics,swim implement metrics in SWIM instance and NIO Shell * prepared testing infra for metrics and prepared most of them * implementest test infra properly for metrics; dead is not a Gauge but Counter * more metrics, lha value as well as shell specific values +testkit move testing utilities to shared module, since we need to reuse them implement more metrics, failures and timing intervals * adjust labels to be unique per type, a prometheus requirement comment out in example by default cleanup * Apply suggestions from code review Co-authored-by: Yim Lee <yim_lee@apple.com> Co-authored-by: Yim Lee <yim_lee@apple.com>
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| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This source file is part of the swift-cluster-membership open source project | ||
| // | ||
| // Copyright (c) 2020 Apple Inc. and the swift-cluster-membership project authors | ||
| // Licensed under Apache License v2.0 | ||
| // | ||
| // See LICENSE.txt for license information | ||
| // See CONTRIBUTORS.txt for the list of swift-cluster-membership project authors | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
|
|
||
| import Metrics | ||
|
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| extension SWIM { | ||
| /// Object containing all metrics a SWIM instance and shell should be reporting. | ||
| /// | ||
| /// - SeeAlso: `SWIM.Metrics.Shell` for metrics that a specific implementation should emit | ||
| public struct Metrics { | ||
| // ==== -------------------------------------------------------------------------------------------------------- | ||
| // MARK: Membership | ||
|
|
||
| /// Number of members (alive) | ||
| public let membersAlive: Gauge | ||
| /// Number of members (suspect) | ||
| public let membersSuspect: Gauge | ||
| /// Number of members (unreachable) | ||
| public let membersUnreachable: Gauge | ||
| // Number of members (dead) is not reported, because "dead" is considered "removed" from the cluster | ||
| // -- no metric -- | ||
|
|
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| /// Total number of nodes *ever* declared noticed as dead by this member | ||
| public let membersTotalDead: Counter | ||
|
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| /// The current number of tombstones for previously known (and now dead and removed) members. | ||
| public let removedDeadMemberTombstones: Gauge | ||
|
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| // ==== -------------------------------------------------------------------------------------------------------- | ||
| // MARK: Internal metrics | ||
|
|
||
| /// Current value of the local health multiplier. | ||
| public let localHealthMultiplier: Gauge | ||
|
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||
| // ==== -------------------------------------------------------------------------------------------------------- | ||
| // MARK: Probe metrics | ||
|
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| /// Records the incarnation of the SWIM instance. | ||
| /// | ||
| /// Incarnation numbers are bumped whenever the node needs to refute some gossip about itself, | ||
| /// as such the incarnation number *growth* is an interesting indicator of cluster observation churn. | ||
| public let incarnation: Gauge | ||
|
|
||
| /// Total number of successful probes (pings with successful replies) | ||
| public let successfulPingProbes: Counter | ||
| /// Total number of failed probes (pings with successful replies) | ||
| public let failedPingProbes: Counter | ||
|
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||
| /// Total number of successful ping request probes (pingRequest with successful replies) | ||
| /// Either an .ack or .nack from the intermediary node count as an success here | ||
| public let successfulPingRequestProbes: Counter | ||
| /// Total number of failed ping request probes (pings requests with successful replies) | ||
| /// Only a .timeout counts as a failed ping request. | ||
| public let failedPingRequestProbes: Counter | ||
|
|
||
| // ==== ---------------------------------------------------------------------------------------------------------------- | ||
| // MARK: Shell / Transport Metrics | ||
|
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| /// Metrics to be filled in by respective SWIM shell implementations. | ||
| public let shell: ShellMetrics | ||
|
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| public struct ShellMetrics { | ||
| // ==== ---------------------------------------------------------------------------------------------------- | ||
| // MARK: Probe metrics | ||
|
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| /// Records time it takes for ping successful round-trips. | ||
| public let pingResponseTime: Timer | ||
|
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| /// Records time it takes for (every) successful pingRequest round-trip | ||
| public let pingRequestResponseTimeAll: Timer | ||
| /// Records the time it takes for the (first) successful pingRequest to round trip | ||
| /// (A ping request hits multiple intermediary peers, the first reply is what counts) | ||
| public let pingRequestResponseTimeFirst: Timer | ||
|
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| /// Number of incoming messages received | ||
| public let messageInboundCount: Counter | ||
| /// Sizes of messages received, in bytes | ||
| public let messageInboundBytes: Recorder | ||
|
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| /// Number of messages sent | ||
| public let messageOutboundCount: Counter | ||
| /// Sizes of messages sent, in bytes | ||
| public let messageOutboundBytes: Recorder | ||
|
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| public init(settings: SWIM.Settings) { | ||
| self.pingResponseTime = Timer( | ||
| label: settings.metrics.makeLabel("roundTripTime", "ping") | ||
| ) | ||
|
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| self.pingRequestResponseTimeAll = Timer( | ||
| label: settings.metrics.makeLabel("roundTripTime", "pingRequest"), | ||
| dimensions: [("type", "all")] | ||
| ) | ||
| self.pingRequestResponseTimeFirst = Timer( | ||
| label: settings.metrics.makeLabel("roundTripTime", "pingRequest"), | ||
| dimensions: [("type", "firstAck")] | ||
| ) | ||
|
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| self.messageInboundCount = Counter( | ||
| label: settings.metrics.makeLabel("message", "count"), | ||
| dimensions: [ | ||
| ("direction", "in"), | ||
| ] | ||
| ) | ||
| self.messageInboundBytes = Recorder( | ||
| label: settings.metrics.makeLabel("message", "bytes"), | ||
| dimensions: [ | ||
| ("direction", "in"), | ||
| ] | ||
| ) | ||
|
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||
| self.messageOutboundCount = Counter( | ||
| label: settings.metrics.makeLabel("message", "count"), | ||
| dimensions: [ | ||
| ("direction", "out"), | ||
| ] | ||
| ) | ||
| self.messageOutboundBytes = Recorder( | ||
| label: settings.metrics.makeLabel("message", "bytes"), | ||
| dimensions: [ | ||
| ("direction", "out"), | ||
| ] | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| public init(settings: SWIM.Settings) { | ||
| self.membersAlive = Gauge( | ||
| label: settings.metrics.makeLabel("members"), | ||
| dimensions: [("status", "alive")] | ||
| ) | ||
| self.membersSuspect = Gauge( | ||
| label: settings.metrics.makeLabel("members"), | ||
| dimensions: [("status", "suspect")] | ||
| ) | ||
| self.membersUnreachable = Gauge( | ||
| label: settings.metrics.makeLabel("members"), | ||
| dimensions: [("status", "unreachable")] | ||
| ) | ||
| self.membersTotalDead = Counter( | ||
| label: settings.metrics.makeLabel("members", "total"), | ||
| dimensions: [("status", "dead")] | ||
| ) | ||
| self.removedDeadMemberTombstones = Gauge( | ||
| label: settings.metrics.makeLabel("removedMemberTombstones") | ||
| ) | ||
|
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| self.localHealthMultiplier = Gauge( | ||
| label: settings.metrics.makeLabel("lha") | ||
| ) | ||
|
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| self.incarnation = Gauge(label: settings.metrics.makeLabel("incarnation")) | ||
|
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| self.successfulPingProbes = Counter( | ||
| label: settings.metrics.makeLabel("probe", "ping"), | ||
| dimensions: [("type", "successful")] | ||
| ) | ||
| self.failedPingProbes = Counter( | ||
| label: settings.metrics.makeLabel("probe", "ping"), | ||
| dimensions: [("type", "failed")] | ||
| ) | ||
|
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| self.successfulPingRequestProbes = Counter( | ||
| label: settings.metrics.makeLabel("probe", "pingRequest"), | ||
| dimensions: [("type", "successful")] | ||
| ) | ||
| self.failedPingRequestProbes = Counter( | ||
| label: settings.metrics.makeLabel("probe", "pingRequest"), | ||
| dimensions: [("type", "failed")] | ||
| ) | ||
|
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| self.shell = .init(settings: settings) | ||
| } | ||
| } | ||
| } | ||
|
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| extension SWIM.Metrics { | ||
| /// Update member metrics metrics based on SWIM's membership. | ||
| public func updateMembership(_ members: SWIM.Membership) { | ||
| var alives = 0 | ||
| var suspects = 0 | ||
| var unreachables = 0 | ||
| for member in members { | ||
| switch member.status { | ||
| case .alive: | ||
| alives += 1 | ||
| case .suspect: | ||
| suspects += 1 | ||
| case .unreachable: | ||
| unreachables += 1 | ||
| case .dead: | ||
| () // dead is reported as a removal when they're removed and tombstoned, not as a gauge | ||
| } | ||
| } | ||
| self.membersAlive.record(alives) | ||
| self.membersSuspect.record(suspects) | ||
| self.membersUnreachable.record(unreachables) | ||
| } | ||
| } |
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