[pkg/stanza] container: remove time field from attributes after parsing

[ChrsMark]

Component(s)

pkg/stanza

Is your feature request related to a problem? Please describe.

This issue keeps track of what was suggested at #33353 (comment).

At the moment when the container parser parses the logs, it parses the time field moving the result to the Timestamp.
However the original time field is preserved in the Attributes. Example:

2024-06-04T06:40:08.219Z	info	ResourceLog #0
Resource SchemaURL: 
Resource attributes:
     -> k8s.pod.uid: Str(d5ecc924-e255-4525-b5be-6437939b1e4d)
     -> k8s.container.name: Str(busybox)
     -> k8s.namespace.name: Str(default)
     -> k8s.pod.name: Str(daemonset-logs-dhzcq)
     -> k8s.container.restart_count: Str(0)
ScopeLogs #0
ScopeLogs SchemaURL: 
InstrumentationScope  
LogRecord #0
ObservedTimestamp: 2024-06-04 06:40:08.007370503 +0000 UTC
Timestamp: 2024-06-04 06:40:07.855932421 +0000 UTC
SeverityText: 
SeverityNumber: Unspecified(0)
Body: Str(otel logs at 06:40:07)
Attributes:
     -> logtag: Str(F)
     -> log.file.path: Str(/var/log/pods/default_daemonset-logs-dhzcq_d5ecc924-e255-4525-b5be-6437939b1e4d/busybox/0.log)
     -> time: Str(2024-06-04T06:40:07.855932421Z)
     -> log.iostream: Str(stdout)
Trace ID: 
Span ID: 
Flags: 0
LogRecord #1
ObservedTimestamp: 2024-06-04 06:40:08.007451031 +0000 UTC
Timestamp: 2024-06-04 06:40:07.957875321 +0000 UTC
SeverityText: 
SeverityNumber: Unspecified(0)
Body: Str(otel logs at 06:40:07)
Attributes:
     -> log.file.path: Str(/var/log/pods/default_daemonset-logs-dhzcq_d5ecc924-e255-4525-b5be-6437939b1e4d/busybox/0.log)
     -> log.iostream: Str(stdout)
     -> time: Str(2024-06-04T06:40:07.957875321Z)
     -> logtag: Str(F)
Trace ID: 
Span ID: 
Flags: 0

Describe the solution you'd like

As mentioned at #33353 (comment), it be would reasonable to remove the original field once its parsed.

One thing to consider here is the possibility of this field being used by some users today. This could happen for users that use the existing Helm preset.
Since the container parser will be a replacement for this preset we need to take this into account.
Maybe we can do this removal through a setting/feature-flag to not aggressively break any users that might use the original time field.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• pkg/stanza: @djaglowski

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[ChrsMark]

Since #33946 was merged with the feature gate, let's keep this issue open to track the graduation of this feature gate.
I will take care of it.

[github-actions]

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Pinging code owners:

• pkg/stanza: @djaglowski

See Adding Labels via Comments if you do not have permissions to add labels yourself.