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Add a new TCP stat for current open connections.

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Such a stat accounts for all connections that are currently
established and not yet transitioned to close state.
Also fix bug in double increment of CurrentEstablished stat.

Fixes #1579

PiperOrigin-RevId: 290827365
This commit is contained in:
Mithun Iyer
2020-01-21 15:43:39 -08:00
committed by gVisor bot
parent ad1968ed56
commit 7e6fbc6afe
6 changed files with 92 additions and 3 deletions
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pkg/sentry/socket/netstack/netstack.go
+2 -1
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@@ -150,7 +150,8 @@ var Metrics = tcpip.Stats{
TCP: tcpip.TCPStats{
ActiveConnectionOpenings: mustCreateMetric("/netstack/tcp/active_connection_openings", "Number of connections opened successfully via Connect."),
PassiveConnectionOpenings: mustCreateMetric("/netstack/tcp/passive_connection_openings", "Number of connections opened successfully via Listen."),
CurrentEstablished: mustCreateMetric("/netstack/tcp/current_established", "Number of connections in either ESTABLISHED or CLOSE-WAIT state now."),
CurrentEstablished: mustCreateMetric("/netstack/tcp/current_established", "Number of connections in ESTABLISHED state now."),
CurrentConnected: mustCreateMetric("/netstack/tcp/current_open", "Number of connections that are in connected state."),
EstablishedResets: mustCreateMetric("/netstack/tcp/established_resets", "Number of times TCP connections have made a direct transition to the CLOSED state from either the ESTABLISHED state or the CLOSE-WAIT state"),
EstablishedClosed: mustCreateMetric("/netstack/tcp/established_closed", "number of times established TCP connections made a transition to CLOSED state."),
EstablishedTimedout: mustCreateMetric("/netstack/tcp/established_timedout", "Number of times an established connection was reset because of keep-alive time out."),