Add Apache2 header to PXL scripts under px

Summary: Required as part of Apache2 license.

Test Plan: N/A

Reviewers: michelle, philkuz, nserrino, #engineering

Reviewed By: philkuz, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D6088

GitOrigin-RevId: e1a89b2bd5a76fdf747971603baec1e1c326a5ee

src/pxl_scripts/px/agent_status/agent_status.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 import px
 
 px.display(px.GetAgentStatus())

src/pxl_scripts/px/cluster/cluster.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 ''' Cluster Overview
 
 This view lists the namespaces and the nodes that are available on the current cluster.

src/pxl_scripts/px/cql_data/data.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 import px
 
 t1 = px.DataFrame(table='cql_events', start_time='-30s')

src/pxl_scripts/px/cql_stats/cql_stats.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 ''' CQL Pod LET metrics
 
 This live view calculates the latency, error rate, and throughput

src/pxl_scripts/px/funcs/funcs.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 import px
 
 # Regular functions.

src/pxl_scripts/px/http_data/data.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 ''' HTTP Data Tracer
 
 This script traces all HTTP/HTTP2 data on the cluster for a specified amount of time.

src/pxl_scripts/px/http_request_stats/stats.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 import px
 
 t1 = px.DataFrame(table='http_events', start_time='-30s')

src/pxl_scripts/px/jvm_data/stats.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 import px
 
 bytes_per_mb = 1024 * 1024

src/pxl_scripts/px/jvm_stats/jvm_stats.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 ''' jvm per Pod and filtered by Node.
 
 This live view summarizes the CPU percentage and network bytes

src/pxl_scripts/px/largest_http_request/data.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 import px
 
 ###############################################################

src/pxl_scripts/px/most_http_data/data.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 import px
 
 ###############################################################

src/pxl_scripts/px/mysql_data/data.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 import px
 
 t1 = px.DataFrame(table='mysql_events', select=['time_', 'remote_addr', 'remote_port',

src/pxl_scripts/px/mysql_stats/mysql_stats.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 ''' MySQL Pod LET metrics
 
 This live view calculates the latency, error rate, and throughput

src/pxl_scripts/px/namespace/namespace.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 ''' Namespace Overview
 
 This view gives a top-level summary of the pods and services in a given namespace,

src/pxl_scripts/px/namespaces/namespaces.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 ''' Namespaces Overview
 
 This view lists the namespaces on the current cluster and their pod and service counts.

src/pxl_scripts/px/network_stats/stats.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 import px
 
 t1 = px.DataFrame(table='network_stats', select=['time_', 'pod_id', 'rx_bytes',

src/pxl_scripts/px/node/node.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 ''' Node Overview
 
 This view summarizes the process and network stats for a given input node in a cluster.

src/pxl_scripts/px/nodes/nodes.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 ''' Nodes Overview
 
 This view summarizes the process and network stats for each node in a cluster.

src/pxl_scripts/px/pid_memory_usage/usage.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 import px
 
 #

src/pxl_scripts/px/pixie_quality_metrics/pixie_quality_metrics.pxl

+# Copyright (c) Pixie Labs, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+
 import px